The fastest way to reduce ketones in urine is to drink more water and eat carbohydrates. If you have diabetes, you may also need insulin adjustments. Ketones appear in urine when your body breaks down fat for energy instead of glucose, and the approach to clearing them depends on why they’re elevated in the first place.
Why Ketones Show Up in Urine
Your body prefers glucose as its primary fuel. When glucose is unavailable or your cells can’t access it, your body switches to burning fat. That fat breakdown produces ketone bodies, which spill into your bloodstream and eventually your urine. The most common triggers are fasting or skipping meals, very low-carb diets, unmanaged diabetes, illness with vomiting or fever, pregnancy-related nausea, and intense prolonged exercise.
The distinction that matters most is between nutritional ketosis and diabetic ketoacidosis (DKA). Nutritional ketosis, from fasting or a low-carb diet, produces moderate ketone levels that are generally manageable. DKA is a medical emergency where ketone levels climb dangerously high because the body has little or no insulin. If ketones in your urine appear alongside high blood sugar (above 240 mg/dL), nausea, vomiting, abdominal pain, or unusual fatigue, that combination points toward DKA and needs immediate medical attention.
What Your Test Results Mean
Urine ketone strips report results in three general ranges:
- Small: less than 20 mg/dL
- Moderate: 30 to 40 mg/dL
- Large: greater than 80 mg/dL
A single small reading usually isn’t cause for concern, especially if you’ve been fasting or eating very few carbs. Moderate levels on more than one test, or any large reading, warrant a call to your healthcare provider. Large ketone levels combined with lethargy and vomiting strongly suggest ketoacidosis.
One important limitation: urine strips detect acetoacetate and acetone but not the main ketone body responsible for acidosis. As your body recovers, it actually converts that dangerous ketone into acetoacetate, so urine strips can stay positive for up to 24 hours after the underlying problem has resolved. Blood ketone meters are more accurate and respond faster to changes, making them a better tool for tracking whether your levels are actually dropping.
Drink More Water
Hydration is the simplest and most immediate step. Water helps your kidneys flush ketones out more efficiently. If you’re mildly dehydrated from illness, exercise, or simply not drinking enough, increasing your fluid intake can make a noticeable difference within hours. Aim to drink water steadily throughout the day rather than large amounts all at once. Clear or pale yellow urine is a good sign you’re adequately hydrated.
If vomiting is preventing you from keeping fluids down, that changes the situation. Persistent vomiting for more than two hours, especially with elevated ketones, may require IV fluids in a medical setting.
Eat Enough Carbohydrates
Ketone production ramps up when carbohydrate intake drops below roughly 50 grams per day. That’s less than what’s in a single plain bagel. If your ketones are elevated because of fasting, skipping meals, or a very low-carb diet, eating carbohydrates is the most direct way to signal your body to stop burning fat as its primary fuel.
You don’t need to overload on sugar. A few servings of whole grains, rice, fruit, or oatmeal can shift your metabolism back toward using glucose. If you’ve been intentionally following a ketogenic diet and want to reduce ketones, gradually increasing your daily carb intake above 50 grams will do it. For most people, eating three regular meals with some carbohydrates at each one is enough to keep ketone production low.
Managing Ketones With Diabetes
For people with diabetes, especially Type 1, ketones in urine are a more serious signal. They typically mean your body isn’t getting enough insulin to move glucose into cells. Without that insulin, your body turns to fat for energy and ketone levels rise, regardless of how much glucose is circulating in your blood.
If you have diabetes and find ketones in your urine, the core issue is restoring adequate insulin levels. Your provider may have given you a “sick day” plan with instructions for adjusting your insulin when ketones appear. Following that plan, combined with hydration and small amounts of carbohydrates, is the standard approach. During illness or when blood sugar is above 240 mg/dL, check for ketones every four to six hours to track whether levels are improving or worsening.
People taking a class of Type 2 diabetes medications called SGLT2 inhibitors face a unique risk. These drugs can trigger ketoacidosis even at normal or near-normal blood sugar levels, which makes it harder to recognize. The American Diabetes Association’s 2025 guidelines added specific recommendations about awareness and prevention for people on these medications.
Ketones During Pregnancy
Ketones in urine during pregnancy are common, particularly in the first trimester when morning sickness makes it hard to eat. Research is mixed on whether mildly elevated ketones pose a risk to the fetus, but very high levels from unmanaged diabetes are dangerous for both mother and baby.
If you’re pregnant and showing ketones, several practical strategies help:
- Don’t skip meals. Eat at least three meals and three snacks daily.
- Have a bedtime snack. Overnight fasting is a common trigger for morning ketones in pregnancy.
- Include carbohydrates at every meal. Rice, oats, whole grain bread, and pasta all work.
- Pair carbs with protein. Eggs, beans, meat, or tofu help stabilize blood sugar.
- Stay hydrated. Drink water consistently throughout the day.
For severe morning sickness that prevents eating, your provider may prescribe anti-nausea medication or IV hydration. Women with gestational diabetes may need dietary adjustments or insulin if food changes alone aren’t controlling glucose and ketone levels. Pregnant women with Type 1 diabetes face a higher risk of DKA, and it can develop more rapidly and at lower blood sugar levels than outside of pregnancy.
Blood Meters vs. Urine Strips
If you’re actively trying to bring ketones down, the tool you use to monitor matters. Urine strips are inexpensive and widely available, but they have real limitations. They can’t detect the ketone body most responsible for acidosis, and they lag behind what’s actually happening in your blood. In one analysis, urine dipstick testing had a sensitivity of 66% and specificity of 78%, compared to 72% and 82% for blood ketone meters.
More importantly, urine strips can remain positive for many hours after blood ketone levels have already returned to normal. This happens because recovering from ketosis involves converting one type of ketone into another that the strips do detect, creating a falsely alarming picture. If you’re managing a serious situation like DKA recovery, blood ketone meters give a faster, more accurate read on whether treatment is working. For routine monitoring of diet-related ketosis, urine strips are generally sufficient.