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?

1/13

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?

2/13

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.

What Happens When You Cut Carbs (4)

You’ll Lose Water Weight

3/13

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.

What Happens When You Cut Carbs (5)

You Might Get the “Keto Flu”

4/13

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.

What Happens When You Cut Carbs (6)

You May Have Brain Fog

5/13

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

6/13

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.

What Happens When You Cut Carbs (8)

Your Breath Might Smell Weird

7/13

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.

What Happens When You Cut Carbs (9)

Your Blood Sugar Levels Might Dip

8/13

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.

What Happens When You Cut Carbs (10)

It Can Tax Your Heart

9/13

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.

What Happens When You Cut Carbs (11)

You Might Feel Moody

10/13

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.

What Happens When You Cut Carbs (12)

Your Liver May Struggle

11/13

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

What Happens When You Cut Carbs (13)

Kidney Problems Can Worsen

12/13

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.

What Happens When You Cut Carbs (14)

It Can Help Control Seizures

13/13

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 if you completely cut out 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.

Will cutting carbs reduce belly fat? ›

A high intake of refined carbs is associated with excessive belly fat. Consider reducing your carb intake or replacing refined carbs in your diet with healthy carb sources, such as whole grains, legumes, or vegetables.

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.

Can you survive without carbs? ›

While some organs can learn to live without carbohydrates, others can't. This means that it is a good idea to include carbohydrates in your diet as they are the easiest way to provide glucose to your body. That being said, you can cut down on or cut out carbs if you are getting enough calories every day.

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 much weight can you lose in a month with no carbs? ›

How Much Weight Can You Lose in a Month on Keto? Individuals on a keto diet can lose an average of 10-12 pounds in their first month if they stay consistent with the diet and maintain a calorie deficit. However, weight loss can vary depending on starting weight, age, and activity level.

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.

What is the 30 30 30 rule? ›

The 30-30-30 rule involves eating 30 grams of protein within 30 minutes of waking up, followed by 30 minutes of low-intensity, steady state cardiovascular exercise. Beyond these steps, the 30-30-30 method doesn't require any changes to other meals or behaviors, restrictions or counting calories.

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.

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.

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.

Is a no carb diet healthy? ›

A no-carb diet eliminates almost all carbs and encourages high intakes of fat and protein. It may boost weight loss, heart health, and blood sugar control. Yet, it's unnecessary to cut all carbs to experience these benefits. Plus, this diet may reduce energy levels and increase your risk of nutrient deficiencies.

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.

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

Cutting out all carbs for two weeks isn't likely to cause long-term damage; however, it can have some uncomfortable effects. Many people complain of hunger and food cravings.

Do our bodies really need carbs? ›

Carbs support brain function, as well as support our gastrointestinal system and microbiome. They spare the body's protein. If we do not have enough carbs stored, the body will instead use amino acids, the building blocks of protein, to make glucose.

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].

Do we really need carbs? ›

Carbohydrates are an essential part of a healthy diet, and they provide many important nutrients. Still, not all carbs are equally good for you.

What are the symptoms of the carb flu? ›

Most people report problems like achiness, headaches, nausea, and constipation, likely due to the sudden change in diet. It typically takes around a week for these side effects to typically resolve, as long as the person on the diet remains strict about their limited carbohydrate intake.

Do unused carbs turn into fat? ›

Dietary carbohydrates provide glucose that body cells can use for energy. Excess glucose beyond what the body needs for immediate energy is converted into glycogen, a storage form of carbohydrate, or converted into fat and stored in body fat cells.

Top Articles
Latest Posts
Article information

Author: Duncan Muller

Last Updated:

Views: 5835

Rating: 4.9 / 5 (79 voted)

Reviews: 94% of readers found this page helpful

Author information

Name: Duncan Muller

Birthday: 1997-01-13

Address: Apt. 505 914 Phillip Crossroad, O'Konborough, NV 62411

Phone: +8555305800947

Job: Construction Agent

Hobby: Shopping, Table tennis, Snowboarding, Rafting, Motor sports, Homebrewing, Taxidermy

Introduction: My name is Duncan Muller, I am a enchanting, good, gentle, modern, tasty, nice, elegant person who loves writing and wants to share my knowledge and understanding with you.