Safely Lowering Blood Ketones: 2 Ways to Reduce Ketone Levels in Urine

When Ketone levels are high, it signals that the body is using fat for energy instead of glucose, often associated with insulin deficiency, high blood sugar, illness, or dehydration. Specifically, when blood sugar is around 250 mg/dL (13.9 mmol/L) or higher, people with diabetes should check for Ketones as the risk of diabetic ketoacidosis (DKA) can increase.

The presence of Ketones isn't always dangerous, but high Ketones accompanied by nausea, vomiting, abdominal pain, increased thirst, dry mouth, rapid or deep breathing, or fruity-smelling breath can be a sign of an emergency. In this article, Tiptory helps you understand how to reduce Ketones, what can help lower Ketones, and most importantly, how to recognize when you shouldn't manage it at home but need urgent medical care.

Method 1: Safely reducing Ketones in people with diabetes

Tip 1: Check blood sugar to reduce Ketones

Regularly monitor blood sugar to detect the risk of rising Ketones

• If you are treating diabetes, especially with insulin, check your blood sugar frequently according to your doctor's plan. When you are sick, have high blood sugar, or are at risk of ketoacidosis, more frequent monitoring helps detect insulin deficiency early. The ADA recommends that sick individuals check Ketones approximately every 4–6 hours; the specific frequency may vary depending on the situation.

• For most non-pregnant adults with diabetes, the ADA typically recommends a target blood sugar of 80–130 mg/dL before meals and under 180 mg/dL 1–2 hours after the start of a meal. However, each person's goals may vary depending on age, underlying conditions, and treatment plan.

Check Ketones when blood sugar is high

• If blood sugar is 240–250 mg/dL or higher, especially if consistently high or recurring, check Ketones according to your healthcare provider's instructions. The ADA currently recommends checking Ketones when blood sugar is 250 mg/dL or higher for at least 2 hours, and also when feeling unwell, dehydrated, or sick.

• If you have two consecutive blood sugar readings of 240 mg/dL or higher, don't just try to lower blood sugar and ignore Ketones. Checking Ketones helps assess whether the body is lacking insulin and switching to fat breakdown for energy.

Understand why high blood sugar can increase Ketone levels

• When the body doesn't have enough insulin, glucose in the blood isn't used effectively for energy. The body starts breaking down fat, which then produces Ketones. If Ketones continue to build up in the blood, the risk of diabetic ketoacidosis (DKA) increases.

• Therefore, the goal of reducing Ketones is not simply to quickly "lower Ketones." More importantly, it's about identifying the cause of the increase in Ketones, especially insulin deficiency, high blood sugar, infection, dehydration, or acute illness.

Do not arbitrarily increase or stop insulin

• If Ketone levels are high, follow the Ketone management plan instructed by your doctor or diabetes care team. Do not arbitrarily skip insulin, even if you are eating less or feeling unwell. The ADA emphasizes that patients should continue insulin as prescribed and may need dose adjustments if specified in the treatment plan.

• When Ketones increase, your doctor may instruct you on correction insulin doses, hydration, and rechecking Ketones after about 2–4 hours. Specific management depends on the type of diabetes, medications being used, blood sugar levels, and Ketone levels.

Know when to seek emergency care

• High Ketone levels accompanied by nausea or vomiting, abdominal pain, rapid or deep breathing, fruity-smelling breath, severe dry mouth, fatigue, or confusion can be signs of DKA. This is an emergency condition that can progress rapidly and requires medical treatment.

• If Ketones continue to rise, do not decrease despite following the management plan, or if you cannot drink water, are vomiting excessively, have difficulty breathing, or are confused, you need to go to the emergency room immediately instead of trying to lower Ketones at home.

Important note: Do not use physical exercise as a way to reduce Ketones when blood sugar is high and Ketones are present. The ADA warns that exercising in this situation can further increase blood sugar.

Tip 2: Check Ketones when blood sugar is high

Check Ketones when blood sugar is 240–250 mg/dL or when feeling unwell

• If blood sugar is high, especially 250 mg/dL (13.9 mmol/L) or higher, or if you are sick, check Ketones in your blood or urine as instructed by your doctor. People with type 1 diabetes should pay special attention because insulin deficiency can cause Ketones to rise rapidly and lead to diabetic ketoacidosis (DKA).

• You can use a blood Ketone meter or urine Ketone test strips. Blood tests usually reflect current beta-hydroxybutyrate (β-OHB) levels better, while urine test strips reflect Ketones excreted in the urine and may change more slowly.

Understand Ketone levels correctly for timely management

• With blood Ketones below 0.6 mmol/L, it is generally not considered a significant increase. However, if blood sugar is high or you are feeling unwell, continued monitoring according to your treatment plan is still necessary.

• Blood Ketones from 0.6 to below 1.5 mmol/L may indicate an increasing risk of DKA, especially when accompanied by high blood sugar. Drink enough water if possible, recheck Ketones, and contact your medical team for guidance.

• Blood Ketones from 1.5 to 3.0 mmol/L are a cause for concern and may be associated with DKA. Contact your doctor or emergency medical services for evaluation, especially if blood sugar is high or symptoms appear.

• Blood Ketones above 3.0 mmol/L indicate a high risk of DKA and require urgent medical evaluation. If you also have vomiting, abdominal pain, rapid or deep breathing, difficulty breathing, confusion, or fatigue, go to the emergency room immediately.

Recheck Ketones if the result is positive

• If you find high Ketones, don't just check once and ignore it. Repeat the test at intervals your doctor has instructed, usually after a few hours, to assess whether Ketone trends are decreasing or increasing.

• If using urine test strips, remember that the results may not accurately reflect current blood Ketone levels. Therefore, when possible, measuring blood Ketones is often more helpful in monitoring acute changes.

Do not exercise when blood sugar is high with Ketones

• You should not try to reduce Ketones by exercising when blood sugar is high and Ketones are positive. Physical activity can cause the body to use more fat and continue to increase Ketones, especially when insulin is insufficient.

• Instead of exercising, prioritize checking Ketones, drinking water if fluid intake is not restricted, and following your blood sugar/insulin management plan as instructed by your doctor.

Special attention when experiencing gestational diabetes

• Ketones in the urine of people with gestational diabetes can appear when not eating enough energy, prolonged fasting, or too long intervals between meals. However, Ketones can also be related to insulin deficiency or acute medical conditions.

• If you have both high blood sugar and Ketones, do not adjust insulin on your own. Contact your obstetrician or diabetes care team for guidance on how to control blood sugar and an appropriate diet.

Don't wait until symptoms are severe

• DKA can progress rapidly. If high Ketone levels are accompanied by severe vomiting, abdominal pain, rapid or deep breathing, fruity-smelling breath, dehydration, drowsiness, or confusion, you need to go to the emergency room immediately instead of continuing to try to lower Ketones at home.

• The goal of reducing Ketones is not just to lower the test number, but to address the cause of Ketone accumulation, especially insulin deficiency and high blood sugar.

Tip 3: Drink enough water to help reduce Ketones

Hydrate sufficiently to help the body excrete Ketones

• When Ketone levels are high, dehydration can make blood sugar more concentrated and worsen the metabolic state. If not restricted by your doctor, drink small sips frequently to maintain adequate fluid intake, especially when you have a fever, vomiting, or diarrhea.

• Water does not directly "flush" Ketones out of the blood. However, adequate fluid replacement helps maintain urine output and supports the kidneys in excreting Ketones, while also helping to limit dehydration when blood sugar is high.

Choose appropriate drinks based on blood sugar levels

• When blood sugar is high, prioritize plain water or unsweetened drinks to replenish fluids without further increasing blood sugar.

• Do not rigidly apply the rule "if blood sugar is above 250 mg/dL, only drink water; if below 250 mg/dL, drink sugary water." Carbohydrate supplementation needs to be based on blood sugar, Ketones, eating ability, and individual insulin management plans.

• If blood sugar is low or at risk of hypoglycemia, carbohydrate-containing drinks may be necessary to treat hypoglycemia. In that case, follow treatment guidelines instead of trying to lower Ketones by completely restricting carbohydrates.

Drink small amounts if nauseous

• If you feel nauseous but can still drink, divide your water into several small portions instead of drinking a large amount at once. This may be easier to tolerate and help maintain fluid intake.

• If you are vomiting continuously and cannot keep fluids down, the risk of dehydration and DKA increases. This is no longer a suitable situation to only try to reduce Ketones at home.

Recheck Ketones after fluid replacement

• If Ketones are rising, continue to monitor blood sugar and Ketones according to the plan your doctor has instructed. You can recheck after a few hours or sooner if the condition worsens.

• When using urine Ketone test strips, understand that the results may have a delay compared to blood Ketones. If you have a blood Ketone meter, testing beta-hydroxybutyrate (β-OHB) may be more useful for monitoring current changes.

Recognize signs that require emergency care

• If high Ketone levels do not decrease or continue to rise, especially when blood sugar is high, contact your doctor for management guidance.

• If you experience severe vomiting, abdominal pain, rapid or deep breathing, difficulty breathing, fruity-smelling breath, severe dry mouth, fatigue, or confusion, seek emergency care immediately. These may be symptoms of diabetic ketoacidosis (DKA).

• Do not try to drink a lot of water to lower Ketones if the condition is severe. Fluid replacement is part of the management, but DKA often requires medical treatment with IV fluids, insulin, and monitoring of electrolytes.

Important note: People with heart disease, kidney disease, or conditions requiring fluid restriction should not arbitrarily increase their water intake to a fixed level. Ask your doctor about the appropriate fluid intake for your condition.

Tip 4: When to call a doctor for high Ketones

Contact your doctor when blood Ketones increase to 1.6 mmol/L

• If blood Ketones are between 1.6 and 3.0 mmol/L, this is a concerning level and may be associated with diabetic ketoacidosis (DKA), especially when blood sugar is high or unusual symptoms appear. Contact your doctor or treatment team immediately for management guidance. Do not just try to lower Ketones at home.

• When calling your doctor, provide complete information on your Ketone levels, current blood sugar, time of measurement, and any symptoms you are experiencing. This information helps healthcare professionals assess the risk more accurately.

Monitor Ketones after using insulin

• If your doctor has instructed you to use correction insulin when Ketones are elevated, administer the correct dose at the specified time. Do not arbitrarily increase the insulin dose as it can lead to dangerous hypoglycemia.

• After taking insulin, continue to check blood sugar and Ketones as instructed. If high Ketone levels do not decrease or continue to rise, notify your doctor immediately.

• When speaking with healthcare professionals, state what type of insulin you used, what dose, and when. This is important information for the doctor to decide whether treatment adjustments are needed.

Ketones above 3.0 mmol/L require emergency care

• If blood Ketones are above 3.0 mmol/L, the risk of DKA is very high. Urgent medical evaluation is needed instead of continuing self-management at home.

• Especially if high Ketones are accompanied by vomiting, abdominal pain, rapid or deep breathing, difficulty breathing, fruity-smelling breath, dehydration, drowsiness, or confusion, go to the emergency room immediately.

• Do not wait for Ketones to decrease on their own, drink excessive amounts of water, or self-inject more insulin to delay going to the hospital. DKA can progress rapidly and usually requires treatment with IV fluids, insulin, and close monitoring of electrolytes.

Don't just look at one Ketone number

• High Ketone levels need to be evaluated along with blood sugar and symptoms. Ketones can increase in many situations such as insulin deficiency, prolonged fasting, vomiting, or acute illness.

• Therefore, the goal of reducing Ketones is not merely to bring the test result down, but to safely address the cause of the increase in Ketones.

Note: Treatment thresholds may vary depending on the type of test, treatment guidelines, and individual circumstances. If your doctor has provided a specific Ketone management plan, prioritize following that plan.

Tip 5: Use insulin correctly to reduce Ketones

Use insulin according to your treatment plan

• When the body lacks insulin, glucose is not effectively utilized by cells for energy. The body switches to breaking down fat for energy, which then produces more Ketones. Therefore, insulin is a crucial component in treating elevated Ketones due to insulin deficiency.

• If you are using insulin, inject the correct type, dose, and at the right time according to your prescription or the Ketone management plan established by your doctor. Do not arbitrarily increase the dose just to reduce Ketones quickly.

Adhere to correction insulin doses when instructed

• Some patients have a pre-established correction insulin dose from their doctor for when blood sugar rises or Ketones appear. In this case, follow these instructions instead of estimating the dose yourself.

• If you have used insulin but high Ketone levels do not decrease, blood sugar continues to rise, or additional unusual symptoms appear, contact your doctor or healthcare facility for evaluation.

• Do not self-inject more insulin multiple times in a short period. Rapid-acting insulin can continue to work for several hours, so uncontrolled cumulative doses can cause severe hypoglycemia.

Do not arbitrarily stop insulin when sick

• When you have the flu, an infection, fever, vomiting, or other acute illnesses, insulin needs can change. People with type 1 diabetes should particularly not stop basal insulin on their own, even if they are eating less.

• If you are unsure about your insulin dose when sick or when Ketones are high, contact your treatment team for specific guidance.

Maintain eating if possible

• Do not try to fast with the goal of lowering Ketones. Prolonged fasting can also cause the body to increase fat breakdown and produce more Ketones.

• If you can still eat, maintain your planned meals and choose foods appropriate for your diabetic nutritional guidelines.

• If nausea or vomiting makes you unable to eat or drink, do not attempt to manage it at home by self-adjusting insulin. This could be a sign that your condition is becoming serious and requires urgent medical evaluation.

Monitor blood sugar and ketones after insulin use

• After administering the instructed insulin dose, continue to check your blood sugar and ketones according to your doctor's plan. Record the time of measurement, results, and insulin dose used to provide to medical staff if necessary.

• If ketones continue to rise, blood sugar does not decrease, or if vomiting, abdominal pain, rapid or deep breathing, shortness of breath, fruity breath odor, severe fatigue, or confusion occur, seek emergency medical care immediately.

Understand rapid-acting insulin correctly

• Rapid-acting insulin typically starts to lower blood sugar after approximately 10–20 minutes, but the onset and duration of action can vary depending on the type of insulin, dosage, and individual.

• Do not rely on a fixed timeframe to self-inject additional insulin. Dosage adjustments should be based on the type of insulin you are using and your individual treatment plan.

Important point: When ketone levels are high, insulin can be a key treatment if the cause is insulin deficiency, but the insulin dose must be individualized. If ketones are very high or there are signs of DKA, prioritize contacting a doctor or emergency services instead of trying to reduce ketones by increasing insulin on your own.

Tip 6: Recognize DKA signs requiring emergency care

Call emergency services if symptoms worsen

• Diabetic ketoacidosis (DKA) is a dangerous acute complication that typically occurs when the body has a severe lack of insulin and begins to produce too many ketones. This condition can progress rapidly, so do not wait until all symptoms appear before seeking emergency care.

• If high blood sugar does not decrease even after using insulin as planned, accompanied by severe dry mouth, frequent urination, excessive thirst, or high ketone levels, contact your doctor or go to a medical facility for evaluation.

Recognize warning signs of DKA

• Seek urgent medical help if one or more of the following signs appear:

  • Severe fatigue or weakness, unusual exhaustion.

  • Excessive thirst, dry mouth, and dry skin, potentially related to dehydration.

  • Nausea, abdominal pain, or vomiting, especially if vomiting is prolonged or you cannot keep fluids down.

  • Rapid, deep, or labored breathing, which may be a sign that the body is trying to compensate for metabolic acidosis.

  • Fruity or acetone-like breath odor, due to volatile ketone bodies.

  • Confusion, difficulty concentrating, unusual drowsiness, or altered consciousness.

Do not attempt to self-reduce ketones with severe symptoms

• Once signs suspicious of DKA appear, you should not just drink water, exercise, or self-increase insulin with the aim of reducing ketones. DKA often requires hospital treatment with insulin, fluid replacement, and electrolyte correction under the supervision of medical professionals.

• Specifically, if blood ketones are above 3.0 mmol/L, or ketones are rapidly increasing accompanied by the aforementioned symptoms, emergency evaluation is needed immediately.

Don't wait for blood sugar to be "too high" to go to the hospital

• DKA can occur even with blood sugar that is not excessively high in some cases, such as in individuals using SGLT2 inhibitors. Therefore, ketones and clinical symptoms are also very important; one should not rely solely on a single blood sugar number.

• If you have diabetes and feel your condition worsening, cannot eat or drink, are vomiting continuously, have difficulty breathing, or show signs of altered consciousness, seek emergency medical care.

Prepare information when going to a medical facility

• If possible, bring or record your blood sugar results, ketone levels, measurement times, and insulin/diabetes medication doses used. This information helps medical staff quickly assess the severity and choose appropriate treatment options.

Important point: When DKA symptoms appear, the goal is no longer to self-lower ketones at home, but to address the cause and prevent dangerous complications. If there is difficulty breathing, confusion, prolonged vomiting, or severe exhaustion, prioritize emergency care instead of waiting for laboratory results to improve.

Method 2: Reducing Ketones for Non-Diabetics

Tip 1: How to measure Ketones using urine test strips

Prepare Ketone test strips and urine sample

• Urine Ketone test strips can be purchased at pharmacies or medical supply stores. Before use, check the expiration date and read the instructions carefully as dipping time, waiting time, and color interpretation may vary between products.

• Prepare a clean, dry, disposable cup to collect the urine sample. Avoid touching the reagent area on the strip as this may affect the results.

Perform the test step-by-step

1. Collect a small amount of urine in a clean cup.

2. Dip the reagent part of the strip into the urine for the exact time specified on the packaging. Do not assume all types of strips need to be dipped for 2 seconds.

3. Remove the strip, and discard excess urine according to the product instructions.

4. Wait for the exact time specified by the manufacturer, then compare the color on the strip to the color chart provided. Do not read too early or too late as the color may continue to change.

Understand Ketone test strip results

• A negative result usually indicates no ketones detected in the urine.

• If the strip changes color corresponding to trace, small, moderate, or large levels, compare it precisely with the color chart of the test kit. Darker colors generally correspond to higher ketone levels, but do not convert the color to an mmol/L value if the product does not provide such a conversion.

• If ketones are detected, especially with high blood sugar or if you are feeling unwell, continue to monitor and follow the management plan your doctor has instructed to safely reduce ketones.

Understand the limitations of urine testing

• Urine test strips do not accurately reflect blood ketone concentrations at the current moment. Ketones take time to be excreted into the urine, so results may lag behind changes in blood ketones.

• The amount of water you drink also affects ketone concentration in urine. Drinking a lot of water can dilute the urine, while dehydration can increase the concentration of substances in the urine.

• Therefore, when a rapid assessment of the risk of high ketone levels is needed, blood ketone testing, especially for beta-hydroxybutyrate (β-OHB), is often more valuable than relying solely on urine test strips.

Choose the right time to test

• It is not necessary to test at a fixed time such as early morning or after dinner. More importantly, test when blood sugar is high, when you are sick, or when symptoms suggestive of increased ketones appear, according to your personalized care plan.

• Ketones can also increase due to fasting, very low-carbohydrate diets, or prolonged exercise, so record the measurement time along with your eating and physical activity status to facilitate result assessment.

When not to rely solely on urine test strips

• If ketone levels are high, results are progressively increasing, or if vomiting, abdominal pain, rapid or deep breathing, shortness of breath, fruity breath odor, severe fatigue, or confusion occur, contact a doctor or go to the emergency room depending on the severity.

• Do not wait for urine test strips to turn negative before seeking medical help if there are signs of diabetic ketoacidosis (DKA). In this situation, the goal is not just to lower ketones, but to quickly identify and treat the underlying cause.

Tip 2: Do not exercise when ketones are high

Temporarily stop exercising when blood sugar is high with ketones

• If you have high ketone levels and elevated blood sugar, you should not exercise with the goal of reducing ketones. When insulin is insufficient, exercise can prompt the body to use fat for energy and further increase ketones.

• Before exercising, individuals with diabetes should check their blood sugar and follow the exercise plan guided by their doctor or diabetes care specialist. When blood sugar is high and ketones are present, prioritize addressing the metabolic condition before returning to exercise.

Why can exercise increase ketones?

• During exercise, the body's energy demands increase. The body may mobilize more fat to create energy, thereby increasing ketone production.

• In individuals with insulin deficiency, this mechanism can become more pronounced. Therefore, attempting to "burn sugar" with an intense workout when blood sugar is high with ketones can worsen the condition instead of helping to lower ketones.

Light activity may be maintained if the body is stable

• It is not necessary to remain completely inactive. Light daily activities such as walking around the house or doing housework may still be appropriate if you feel well and show no signs of DKA.

• However, avoid activities that significantly increase heart rate, cause heavy sweating, or involve strenuous effort, especially when blood sugar is high and ketones are positive.

• If you experience severe fatigue, dizziness, nausea, shortness of breath, or abdominal pain, stop the activity and seek medical assistance.

Recheck before returning to exercise

• After high ketone levels have been managed and blood sugar returns to a safe range according to the treatment plan, you can gradually resume physical activity.

• If you frequently experience elevated blood sugar or ketones after exercise, discuss this with your doctor to evaluate your insulin, nutrition, timing of exercise, and intensity of physical activity.

Do not use exercise to self-lower ketones

• When there are no ketones and blood sugar is well-controlled, regular physical activity still provides many benefits for individuals with diabetes.

• However, when ketones are high, the priority is to assess the cause, check blood sugar and ketones, rehydrate if appropriate, and use insulin according to the treatment plan. If there are signs of DKA, emergency care is needed instead of trying to exercise to reduce ketones.

Note: The blood sugar and ketone thresholds for temporarily stopping exercise may vary depending on individual health status and personal guidelines. If your doctor has provided a "sick-day" procedure or ketone management plan, prioritize following those instructions.

Tip 3: Supplement carbohydrates when ketones increase

Supplement carbohydrates if ketones increase due to insufficient carb intake

• If you are following a very low-carbohydrate diet or a keto diet and experience ketones due to carbohydrate deficiency, increasing your carb intake can help your body gradually switch to using glucose instead of relying heavily on fat for energy.

• However, do not automatically assume that every case of high ketones is due to low carb intake. In individuals with diabetes, especially type 1 diabetes, elevated ketones can be a sign of insulin deficiency and diabetic ketoacidosis (DKA). This case requires medical evaluation, and you should not just eat more carbohydrates to lower ketones.

Increase carbohydrates gradually and choose appropriate foods

• If your doctor determines that ketones are related to an excessively low-carbohydrate diet, you can increase carbs gradually instead of abruptly changing your diet.

• Prioritize nutrient-rich carbohydrate sources such as:

  • Whole grains, oats, rice, potatoes, and legumes.

  • Vegetables, whole fruits.

  • Milk or suitable dairy products if you can tolerate them.

• Combine carbohydrates with protein, healthy fats, and fiber to help balance meals and limit rapid blood sugar fluctuations.

No need to apply the same carbohydrate ratio for everyone

• The appropriate carbohydrate level depends on total energy, age, activity level, medications being used, blood sugar control goals, and health status.

• A benchmark of 130 g of carbohydrates/day is often used as a minimum reference for adult diets, but it is not a mandatory target for every individual. People with high energy needs may require more carbohydrates.

• Therefore, instead of trying to achieve a fixed percentage like 25% or 45–60% of energy, diet plans should be developed based on actual needs and consultation with a doctor or dietitian.

Distinguish nutritional ketones from ketones due to insulin deficiency

• Ketones can appear when the body is fasting, eating very few carbohydrates, or following a keto diet. These are often called nutritional ketones or "starvation ketones."

• Conversely, when insulin is deficient, glucose accumulates in the blood but cells cannot use it effectively. The body increases fat breakdown and produces many ketones, which can lead to DKA.

• If blood sugar is high and ketones are also elevated, especially in individuals with diabetes, do not automatically conclude that the cause is simply a low-carb diet.

Be especially cautious if you have diabetes

• If you have high ketone levels, check your blood sugar and follow the ketone management plan your doctor has instructed.

• Do not arbitrarily stop insulin or change medication doses to continue a keto diet.

• If ketones increase accompanied by nausea, vomiting, abdominal pain, rapid or deep breathing, shortness of breath, fruity breath odor, severe fatigue, or confusion, urgent medical care is needed.

The goal is to restore the body to a safe metabolic state

• For healthy individuals following a low-carb diet, appropriate carbohydrate supplementation can help reduce fat breakdown and thus assist in reducing ketones.

• However, if ketones increase due to insulin deficiency, simply increasing carbohydrates will not address the root cause. In such cases, safely lowering ketones requires focusing on treating insulin deficiency and factors causing blood sugar dysregulation according to medical guidelines.

Tip 4: Limit fasting to reduce ketones

Avoid prolonged fasting if you want to reduce ketones

• Prolonged fasting or excessive intermittent fasting can deplete the body's glucose supply and cause it to switch to breaking down fat for energy. This process leads the liver to produce more ketones.

• Therefore, if high ketone levels appear after a period of fasting, eating too little, or strict carbohydrate restriction, consider adjusting your diet instead of continuing to fast for weight loss.

Maintain regular meals

• It is not essential for everyone to eat exactly 3 main meals and 1–2 snacks daily. What is more important is to maintain an energy and carbohydrate intake suitable for your body's needs, avoiding excessively long fasting periods if you are prone to increased ketones.

• Meals can be divided into smaller portions if you experience nausea, poor appetite, or need to maintain stable blood sugar levels.

• Prioritize nutrient-rich foods such as vegetables, fruits, whole grains, legumes, lean protein, and unsaturated fats to build a balanced diet.

If you want to lose weight, extreme fasting is not necessary.

• To manage weight, focus on portion control, choosing minimally processed foods, and maintaining appropriate physical activity, rather than excessive fasting.

• Losing weight too quickly or severely restricting energy intake can increase fat burning and ketone production. For some individuals, this might be nutritional ketosis; however, for people with diabetes, extreme caution is needed as high ketones can be associated with insulin deficiency.

Special considerations if you have diabetes

• If you have diabetes and high ketones, do not attempt to fast on your own to lower ketones. Check your blood sugar and ketones, and follow the management plan advised by your doctor.

• Individuals with type 1 diabetes should not fast or skip insulin on their own. Insulin deficiency combined with fasting can increase the risk of DKA.

• If high blood sugar is accompanied by ketones and symptoms such as vomiting, abdominal pain, rapid or deep breathing, shortness of breath, fruity-smelling breath, or confusion, seek emergency medical attention.

Caution with religious fasting

• If you regularly fast for religious reasons, discuss this with your doctor if you have diabetes, are taking insulin, or have previously experienced elevated ketones.

• Depending on your health status, your doctor may suggest shortening fasting periods, adjusting meal and medication timings, or temporarily suspending fasting to prevent complications.

Not all ketones are dangerous

• Ketones are normal metabolic byproducts when the body uses fat for energy. Therefore, ketones can increase during fasting or very low carbohydrate intake without necessarily indicating DKA.

• The concern arises when ketones are significantly elevated, especially when accompanied by high blood sugar or symptoms such as dehydration, vomiting, abdominal pain, and difficulty breathing. In such cases, the goal is not just to lower ketones, but to identify the cause and manage it promptly.

Important note: If ketones are elevated due to fasting or a very low carbohydrate diet, a complete and balanced diet can help to lower ketones. However, if ketones are elevated due to insulin deficiency, dietary changes alone are insufficient to address the underlying cause and may delay necessary treatment.



Tip 5: Limit alcohol to reduce ketones

Limit or avoid alcohol when ketones are elevated

• Alcohol can disrupt glucose and fat metabolism, especially when consumed in large amounts, during fasting, or if vomiting occurs after drinking. In these situations, the body is more likely to switch to using fat for energy and produce more ketones.

• Therefore, if you have high ketone levels, especially if accompanied by abnormal blood sugar, you should temporarily avoid alcohol instead of continuing to drink for relaxation or to "stabilize blood sugar."

Do not assume alcohol only increases ketones by reducing insulin

• The mechanism is more complex. Alcohol can inhibit glucose production in the liver, increase fat breakdown, and promote ketone formation. When consumed in large amounts without sufficient food intake, the risk of alcoholic ketoacidosis increases.

• Notably, alcoholic ketoacidosis can occur with normal or low blood sugar, which differs from the typical presentation of DKA in individuals with insulin deficiency and hyperglycemia. Therefore, blood sugar levels alone cannot rule out a dangerous condition.

Avoid alcohol when fasting or eating poorly

• The risk of increased ketones is particularly significant when consuming large amounts of alcohol followed by skipping meals, vomiting, or being unable to eat for an extended period. When glucose reserves decrease, insulin levels drop, and fat breakdown increases, leading to ketone accumulation.

• If you are trying to lower ketones, you should not combine alcohol with fasting or a very low carbohydrate diet. This combination can lead to more severe metabolic disturbances.

Exercise extreme caution if you have diabetes

• People with diabetes should be aware that alcohol can increase the risk of hypoglycemia, especially when using insulin or certain blood sugar-lowering medications. This effect can last for many hours after drinking.

• If you have consumed alcohol and also have high ketones, do not attempt to adjust your insulin on your own to reduce ketones. Contact your doctor for guidance based on your blood sugar, ketone levels, alcohol intake, and current medications.

Recognizing signs of alcoholic ketoacidosis

• If, after heavy alcohol consumption, you experience nausea, persistent vomiting, abdominal pain, excessive thirst, rapid or deep breathing, dizziness, severe weakness, or confusion, seek emergency medical evaluation. These symptoms may be related to alcoholic ketoacidosis or another complication requiring treatment.

• Do not attempt to self-treat by drinking more alcohol, fasting, or only consuming water to lower ketones. Alcoholic ketoacidosis often requires blood tests, electrolyte assessment, and treatment with intravenous fluids, glucose, thiamine, and electrolytes as needed.

If you are alcohol-dependent, do not suddenly quit on your own.

• If you regularly consume large amounts of alcohol or show signs of dependence, speak to a doctor before stopping alcohol. Abrupt cessation of alcohol in dependent individuals can cause severe withdrawal symptoms and requires medical supervision.

• Your doctor can assess your alcohol use, nutritional status, and risk of complications, and refer you to appropriate treatment programs or specialists.

The goal is to address the cause, not just lower ketones.

• Alcohol is not the only cause of elevated ketones. Fasting, dehydration, vomiting, acute illness, and insulin deficiency can all contribute to ketone accumulation.

• Therefore, if ketone levels are high, especially with unusual symptoms, do not just try to reduce ketones at home. It is important to identify the cause and seek medical attention if there are signs of ketoacidosis.



Tip 6: Treat eating disorders when ketones are high.

Treat eating disorders to reduce the risk of elevated ketones.

• Prolonged fasting and excessive dietary restriction can lead to glucose deficiency in the body, forcing it to increasingly use fat for energy. This results in the liver producing more ketones. In some cases, this process can lead to non-diabetic ketoacidosis.

• If you are experiencing symptoms of anorexia nervosa or another eating disorder, the goal should not merely be to reduce ketones. More importantly, restore adequate nutrition and treat the underlying cause with the support of a doctor, nutritionist, and mental health professional.

Medical examination for elevated ketone levels

• If you have a history of severe dietary restriction, prolonged fasting, and discover high ketone levels, contact a doctor for evaluation. The doctor may order tests for blood ketones, glucose, electrolytes, and acid-base balance to determine the risk of ketoacidosis.

• Do not assume that elevated ketones are solely due to diet. Many other factors, such as insulin deficiency, infection, dehydration, vomiting, or alcohol consumption, can also increase ketones.

Restore nutrition instead of continuing to fast.

• When elevated ketones are related to energy deficiency, adequate carbohydrate and energy intake can help the body reduce its reliance on fat for fuel.

• Do not force yourself to eat large amounts in a short period if you have eaten very little for a long time. Malnourished individuals may be at risk for refeeding syndrome, so nutritional rehabilitation should be implemented according to a healthcare team's plan when the risk is high.

• If you are being treated for an eating disorder, adhere to the meal plan developed by your doctor or nutritionist instead of self-implementing a keto diet, fasting, or cutting carbohydrates to control weight.

Recognize the signs of ketoacidosis.

• Seek emergency medical care if ketones are high accompanied by:

  • Severe fatigue or weakness.

  • Dry, hot, or flushed skin, often related to dehydration.

  • Nausea, abdominal pain, or persistent vomiting.

  • Rapid, deep breathing, or shortness of breath.

  • Fruity-smelling breath.

  • Confusion, difficulty concentrating, or altered consciousness.

• These signs can occur in ketoacidosis, and you should not wait for ketones to decrease on their own before seeking medical attention. Non-diabetic ketoacidosis can still be serious, even if the patient does not have diabetes.

Do not attempt to lower ketones by fasting or exercising.

• When ketone levels are high due to insufficient energy intake, continuing to fast or engage in intense exercise can cause the body to continue using fat and produce more ketones.

• The safe goal is to restore nutrition, adequately rehydrate, and treat the underlying cause. If ketoacidosis is present, treatment should be administered in a medical facility rather than attempting to reduce ketones at home.

Treating eating disorders is part of the recovery process.

• If dietary restriction stems from concerns about weight, body image, or fear of eating, seek professional support instead of attempting to manage ketones yourself.

• Treating eating disorders often requires a multidisciplinary approach involving medical care, nutritional rehabilitation, and psychological support. Addressing the root cause helps reduce the risk of recurrent ketone elevation and protects long-term health.

Important note: Reducing ketones in cases of malnutrition does not mean forcing the body to use glucose at all costs. If ketones are elevated due to fasting or an eating disorder, safe nutritional rehabilitation and assessment of ketoacidosis risk are necessary, especially if unusual symptoms appear.



Monitoring Ketones for Diabetes

Prepare blood glucose and ketone monitoring equipment.

• If you have diabetes, especially type 1 diabetes, you should have a blood glucose meter and means to test blood ketones or urine ketones at home as instructed by your treatment team.

• Blood ketone meters can help monitor beta-hydroxybutyrate (β-OHB), a key ketone in assessing the risk of diabetic ketoacidosis (DKA). It is not strictly necessary to use a single device that measures both blood glucose and ketones; the important thing is that the equipment is appropriate and used correctly.

Increase testing frequency when ill.

• When you have a cold, flu, or infection, your body can release stress hormones like cortisol and adrenaline. These hormones can increase blood sugar and promote ketone production, especially when insulin is insufficient.

• If you have diabetes and are ill, check your blood sugar more frequently. The ADA recommends checking ketones approximately every 4–6 hours when sick or when blood sugar is high, depending on your individual care plan.

• If ketone levels are high, continue to monitor them as directed by your doctor and do not discontinue insulin on your own, even if you are eating less.

Recognize the signs of ketoacidosis.

• DKA is a life-threatening complication and requires medical treatment. Pay special attention if elevated ketones are accompanied by symptoms:

  • Severe fatigue or weakness.

  • Dry, hot, or flushed skin, often related to dehydration.

  • Nausea, abdominal pain, or persistent vomiting.

  • Rapid, deep breathing, or shortness of breath.

  • Fruity-smelling breath.

  • Confusion, difficulty concentrating, or altered consciousness.

• If you experience shortness of breath, confusion, persistent vomiting, or severe weakness, you must go to the emergency room or call emergency services immediately. Do not continue to try to reduce ketones at home.

Do not rely solely on blood sugar.

• High blood sugar is an important sign but not the only factor in assessing DKA risk. In some cases, DKA can occur when blood sugar is not excessively high, such as when using SGLT2 inhibitors.

• Therefore, when ill, pay attention to both blood sugar, ketones, and body symptoms. This combination helps detect abnormal metabolic conditions early and seek timely medical support.

Important note: If your doctor has provided a specific "sick-day" plan, prioritize that plan. When ketone levels are high or there are signs of DKA, the goal is not just to reduce ketones, but to address the underlying cause and prevent dangerous complications as early as possible.

References

1. American Diabetes Association Professional Practice Committee for Diabetes. 9. Pharmacologic Approaches to Glycemic Treatment: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1):S183–S215.
2. American Diabetes Association Professional Practice Committee for Diabetes. 16. Diabetes Care in the Hospital: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1):S339–S355.
3. American Diabetes Association. Diabetes and Planning for Sick Days. American Diabetes Association; 2026.
4. Umpierrez G, Davis GM, ElSayed NA, et al. Hyperglycemic Crises in Adults With Diabetes: A Consensus Report. Diabetes Care. 2024;47(8):1257–1275. doi:10.2337/dci24-0032.
5. Dhatariya KK, Glaser NS, Codner E, Umpierrez GE. Diabetic ketoacidosis. Nature Reviews Disease Primers. 2020;6:40.
6. Dhatariya KK; Joint British Diabetes Societies for Inpatient Care. The Management of Diabetic Ketoacidosis in Adults—An Updated Guideline from the Joint British Diabetes Societies for Inpatient Care. Diabetic Medicine. 2022;39:e14788.
7. Umpierrez G, Korytkowski M. Diabetic emergencies—ketoacidosis, hyperglycaemic hyperosmolar state and hypoglycaemia. Nature Reviews Endocrinology. 2016;12:222–232.
8. Brutsaert EF. Acute Complications of Diabetes Mellitus. Merck Manual Professional Edition. Updated May 2026.
9. Merck Manual Editorial Staff. Alcoholic Ketoacidosis. Merck Manual Consumer Version. Updated January 2026.
10. Long B, Lentz S, Gottlieb M. Alcoholic Ketoacidosis: Etiologies, Evaluation, and Management. The Journal of Emergency Medicine. 2021;61(6):658–665. doi:10.1016/j.jemermed.2021.09.007.
11. Knight-Dunn L, Gorchynski J. Alcohol-Related Metabolic Emergencies. Emergency Medicine Clinics of North America. 2023;41(4):809–819. doi:10.1016/j.emc.2023.07.003.

Content edited by: Leigh Kennedy Ly.


Information consulted and verified by expert: Sophia Miller.