Does pee smell when losing weight?

Author: Dr. Jarvis Moore DDS  |  Last update: Friday, December 26, 2025

The sweet smell is from ketonuria, or a buildup of ketones. Those are chemicals your body makes when you burn fat, instead of glucose, for energy.

Does fat smell when you pee it out?

When a person eats a lot of protein instead of carbohydrates, their body uses protein and stored fat for energy instead of using carbohydrates as it would usually do. As a result, the ketone level in the blood will rise. When these ketones leave the body in the urine, the urine may smell sweet or similar to popcorn.

Do you smell bad when losing weight?

Why do I smell weird when losing weight? Certain weight-loss diets low in carbohydrates can cause a process known as ketosis, which is the burning of fat in the body. This process produces chemicals called ketones, which have an unusual “fruity” smell that can linger in the saliva.

What does ketosis smell like?

Acetone is what gives your breath that distinctive "ketosis" smell, which, according to Medline Plus, can be compared to an overly sweet, fruity scent (not in a good way).

What is the smell of burning fat?

Acrolein (systematic name: propenal) is the simplest unsaturated aldehyde. It is a colorless liquid with a foul and acrid aroma. The smell of burnt fat (as when cooking oil is heated to its smoke point) is caused by glycerol in the burning fat breaking down into acrolein.

Pee Smells Bad? What Causes Strong Stinky Odor After Urination? – Dr. Berg

Which body part loses fat first?

Mostly, losing weight is an internal process. You will first lose hard fat that surrounds your organs like liver, kidneys and then you will start to lose soft fat like waistline and thigh fat. The fat loss from around the organs makes you leaner and stronger.

Is losing 7 pounds noticeable?

CDC further recommends that you need to lose around 5-10% of your total body weight to notice changes. For instance, if you weigh 170 pounds, you need to lose roughly 8.3-17 pounds to notice a difference. The results should also be measured after at least three months, for certainty.

How long does it take to lose 20 pounds?

To lose weight effectively and safely, aiming to lose 1 to 2 pounds (lbs) per week may be best. This means that losing 20 lbs may take 10 to 20 weeks. To lose weight, people will likely need to follow a healthy diet and get regular exercise. Some popular diets are effective initially but challenging to maintain.

Does urine smell more when losing weight?

The sweet smell is from ketonuria, or a buildup of ketones. Those are chemicals your body makes when you burn fat, instead of glucose, for energy.

Does drinking more water help you lose weight?

Drinking water can temporarily boost your metabolism. According to the National Institute of Health, drinking 500 ml of water can increase your metabolic rate by 30 percent for about an hour. A higher metabolism means your body burns calories faster, which is crucial for weight loss.

How do you know when fat is leaving your body?

You can look for some of the physical cues that your body is burning fat in the day-to-day and as you change your lifestyle habits: Increased Energy: Burning fat releases energy, making you feel more energetic during workouts or throughout the day.

When you burn fat do you pee it out?

The byproducts of fat metabolism leave your body: As water, through your skin (when you sweat) and your kidneys (when you urinate).

Does ketosis make your pee smell?

7 If your urine smells sweet or strong and is a darker shade of amber, drink more water. Keto and other diets that are very low in carbohydrates can make your urine smell unusual or fruity due to nutritional ketosis.

What does fatty liver urine smell like?

Foetor hepaticus is a feature of severe liver disease; a sweet and musty smell both on the breath and in urine. It is caused by the excretion of dimethyl disulphide and methyl mercaptan (CH3SH)2, arising from an excess of methionine.

What are the stages of fat loss?

In general, though, weight loss can be delineated into three stages: rapid weight loss, gradual weight loss, and maintenance. The length of each stage depends on the individual, Michelle Routhenstein, R.D., preventive cardiology dietitian says.

Is losing 30 pounds in a month healthy?

While it's possible to drop a lot of weight in one month, we don't recommend it. Anything over 8 pounds is likely water weight that you'll gain back. Crash dieting leads to gaining more weight long-term and slows your metabolism.

Does the face lose fat first?

Nevertheless, people's face and neck are the body parts that lose weight first when diet dominates. You will begin to see the reduction in face and neck fat when you are a bouquet of losing weight.

What body part is the hardest to lose fat?

The abdomen is often one of the hardest places to lose body fat, particularly because of its deep connection to these hormonal processes.

Why do I stink while losing weight?

By drastically reducing carbs and increasing fat, the body enters a state of ketosis, burning fat for fuel instead of glucose. While the diet boasts numerous benefits, there is a less glamorous side effect that many followers experience – bad breath and body odor.

Does burning fat have a feeling?

What does it feel like to be in fat-burning mode? Many people report feeling more energetic, mentally sharp, satisfied after meals, and less hungry throughout the day. You may also start to notice your clothes fitting differently or that you're losing belly fat.

What does human fat smell like?

The sickening stench experienced daily by those in the camps would have been comprised primarily of a beef-like smell from burning flesh, and a pork-like smell from human fat.

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