What Happens When You Cut Carbs (2024)

What Happens When You Cut Carbs (1)
Medically Reviewed by Zilpah Sheikh,MD on August 28, 2023

Written by Janie McQueen

What Happens When You Cut Carbs (2)

What Does Cutting Carbs Do?

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Carbs are a basic nutrient your body turns into glucose, or blood sugar, to make energy for your body to work. A very low-carb diet, like keto and the early phase of the Atkins Diet, triggers your body into nutritional ketosis. Your liver starts to make ketones -- a fuel that kicks in when your body doesn’t have enough sugar to run on -- by breaking down fat.

What Happens When You Cut Carbs (3)

How Low Is Low-Carb?

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To bring about nutritional ketosis, extreme low-carb diets cap your carb intake at less than 10% of your total macronutrient (carbs, fat, and protein) intake. That translates to 20 to 50 grams a day of carbs. Low-carb diets generally shoot for under 26% of nutrition intake, or 130 grams.Here are a few examples of common high-carb low-fat foods.

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You’ll Lose Water Weight

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A sudden lack of carbs will make you lose weight. It’s mostly water weight at first, though. This is mostly because cutting carbs also wipes out the glycogen stores in your muscles. Glycogen helps your body retain water. You may also lose some salt along with the carbs you cut out. When you start to eat carbs again, the water weight comes right back. It takes 2 to 3 weeks for ketosis to rev up and start to burn fat.

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You Might Get the “Keto Flu”

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Ketosis can lead to weakness, fatigue, dizziness, and headaches, which can feel a lot like flu symptoms. More serious side effects can happen too, like stomach pain, nausea, and vomiting. Some doctors think this is caused by not getting enough nutrients from fruits, beans, veggies, and whole grains -- foods not allowed, or strictly limited, on a keto diet.

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You May Have Brain Fog

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You may feel foggy as your body tries to keep up normal blood sugar levels. It might be hard to sleep at first. You might feel very tired, which will make your brain feel even fuzzier for a while.

Your Belly Might Bloat

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Low-carb diets are also low on fiber. Constipation can strike, although it usually clears up in a few weeks. You can get some fiber from watery fruit like watermelon. Also, gas can get trapped in your digestive tract. Your stomach might feel too full and hurt. If you stay well-hydrated and get enough electrolytes (minerals that help balance your body water and nourish your cells), your symptoms might not be as serious or last as long.

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Your Breath Might Smell Weird

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When your body runs on fatty acids instead of carbs, it releases ketones through your breath as acetone. Your breath might smell fruity or sweet. Some say it tastes like decaying apple. Also, if your mouth is dry, you can have bad breath. That’s because there’s not enough saliva to get rid of bacteria and extra food particles in your mouth. So stay hydrated.

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Your Blood Sugar Levels Might Dip

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A super low-carb diet can lower your blood sugar levels. This can help if you have diabetes. But in true ketosis, hypoglycemia is a risk. This happens when your blood sugar dips too low. The go-to treatment is to have 15 grams of carbs to raise it. If it’s still too low after 15 minutes, you’ll need another 15 grams. If you have diabetes, check your sugars often and know that you may need to adjust your meds while on this diet.

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It Can Tax Your Heart

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Very low-carb diets also are high-fat. Your saturated fat intake should be no more than 5% to 6% of your total. Focus on healthy fats like those in avocados, olives, and nuts. On the keto diet (as well as less strict low-carb diets like Atkins and Paleo), your triglycerides and HDL (“good”) cholesterol levels will likely get better. But you may see a rise in LDL, or “bad” cholesterol, which can also lead to heart disease.

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You Might Feel Moody

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Your state of mind can get wonky when you sharply cut healthy carbs that send sugar to the brain. You might feel grouchy. One study found people who followed low-carb diets over time had less serotonin in their brains than those who were on low-fat diets. Healthy serotonin levels help guard against anxiety and depression.

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Your Liver May Struggle

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On a low-carb diet, your liver has a lot more fat to process. This can make an existing condition worse.

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Kidney Problems Can Worsen

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Nutritional ketosis may bump up uric acid levels, leading to kidney stones or gout flares. One study found people with mild chronic kidney disease on the keto diet did OK with close medical supervision. But others show those who eat any diet high in red meat and low in whole grains, low-fat dairy, and fruit are 97% more likely to get kidney disease. This is partly why some dietitians advise against doing extreme low-carb diets on your own.

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It Can Help Control Seizures

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People have used the keto diet for some 100 years to treat epilepsy, mainly in children who don’t respond to meds. It means that someone will have to watch you and do frequent lab checks and urine tests. Studies go on as to how the keto diet might also help people with brain disorders like Parkinson’s disease. There aren’t any firm results yet, though.

What Happens When You Cut Carbs (2024)

FAQs

What Happens When You Cut Carbs? ›

Severe carb limits can cause your body to break down fat into ketones for energy. This is called ketosis. Ketosis can cause side effects such as bad breath, headache, fatigue and weakness. It's not clear what kind of possible long-term health risks a low-carb diet may pose.

Does cutting carbs help lose belly fat? ›

Reducing your carb intake can be very beneficial for losing fat, including abdominal fat. In fact, low carb diets may cause belly fat loss in people with overweight, those at risk for type 2 diabetes, and people with polycystic ovary syndrome (PCOS) ( 31 , 32 , 33 ). You don't have to follow a strict low carb diet.

What are the symptoms of carbohydrate withdrawal? ›

Symptoms of carbohydrate withdrawal or keto induction are constipation, headache, halitosis, muscle cramps, bloating, diarrhea, general weakness, and rash [30,31].

What happens if you eat no carbs for 30 days? ›

As your body starts to rely on ketones from the fat you're burning instead of glucose from carbohydrates, you may experience fatigue, mental fogginess and even irritability.

What happens if I eat no carbs for 2 months? ›

Low energy: Carbs are your body's primary source of energy. Therefore, a no-carb diet may lead to low energy and fatigue. Insufficient nutrients: A no-carb diet may not provide enough vitamins and minerals, such as potassium, B vitamins, and vitamin C, which are abundant in fruits, vegetables, and other plant foods.

What burns the most belly fat? ›

Aerobic exercise includes any activity that raises your heart rate such as walking, dancing, running or swimming. This can also include doing housework, gardening and playing with your children. Other types of exercise such as strength training, Pilates and yoga can also help you lose belly fat.

Will I lose body fat if I stop eating carbs? ›

A low-carb diet is meant to cause the body to burn stored fat for energy, which leads to weight loss.

What is the number one worst carb? ›

1. Sugary Foods. Most people already think of many of the foods in this category as unhealthy treats. Candy, soft drinks, and sweet desserts such as cake, chocolate, and ice cream are all expected entries on a list of carbs to avoid to lose weight.

How to flush carbs out of your body? ›

Start by drinking more water and increasing your fiber intake (try eating more non-starchy vegetables or taking a fiber supplement). Ginger, peppermint and licorice – either fresh or in tea form – can also help to get things moving, as can taking magnesium, probiotics or digestive enzymes.

Why do I feel better when I don't eat carbs? ›

Our brains prefer glucose, and carbohydrates supply a steady and easily available source. When you stop eating them, your body is forced to find an alternative energy source for the brain. It will switch to breaking down fat into ketones, an alternative to glucose.

Why is cutting carbs bad? ›

Your state of mind can get wonky when you sharply cut healthy carbs that send sugar to the brain. You might feel grouchy. One study found people who followed low-carb diets over time had less serotonin in their brains than those who were on low-fat diets.

How many carbs are too low? ›

"Since lots of people think about carbs in terms of grams, anything lower than 100 grams daily is pretty low," says Lisa Valente, M.S., R.D.

What's the healthiest carb? ›

Try these healthy carb foods

Limit the processed stuff. What are some of the best sources of healthy carbs? Romito suggests these foods: Whole grains: Farro, quinoa, whole-grain breads and pastas, bulgar wheat, and brown or wild rice.

Does eating less carbs flatten your stomach? ›

Limiting your total carb intake may help reduce belly fat and support weight loss . However, you don't have to cut out all carbs to reap the benefits, especially if a low carb diet isn't ideal for you.

What is the best diet to get rid of belly fat? ›

Focusing on plant-based foods, such as fruits, vegetables and whole grains. Choosing lean sources of protein, such as fish and low-fat dairy products. Limiting processed meats, as well as the saturated fat that's found in meat and high-fat dairy products, such as cheese and butter.

Will I lose belly fat if I cut out bread? ›

It's not about the specific foods you eat or don't eat when you're trying to lose weight; instead, it's all about your overall daily intake of calories. Cutting back on bread products can be part of a strategy to lower your calorie or carb intake for weight loss.

Does cutting carbs make you look leaner? ›

The number on the scale is lower, and admittedly you look thinner because your belly also tends to retain more water when you eat carbohydrates. All of those flat belly diets, that's how they work: If you don't eat carbs, you don't have a lot of water in your belly, so you don't look bloated.

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