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.

What Happens When You Cut Carbs (4)

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.

What Happens When You Cut Carbs (12)

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 if you cut out carbs completely? ›

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? ›

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 side effects of not eating carbs? ›

Complications such as heart arrhythmias, cardiac contractile function impairment, sudden death, osteoporosis, kidney damage, increased cancer risk, impairment of physical activity and lipid abnormalities can all be linked to long-term restriction of carbohydrates in the diet.

What happens if you don't eat carbs for a month? ›

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 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.

Why you shouldn't cut carbs? ›

Carbohydrates are actually super important

Macronutrients are a form of energy that our bodies use for fuel. And this energy is super important for your brain function, as well as for protecting against disease. Not to mention, it'll give you long-lasting energy to power through your day and workout.

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.

What are the 5 foods that burn belly fat? ›

What foods burn belly fat fast?
  • Whole grains.
  • Non-starchy vegetables.
  • Fruits such as berries, apples, pears, avocados.
  • Olive oil.
  • Beans.
  • Legumes.
  • Nuts.
  • Seeds.
Apr 9, 2024

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 happens if you only eat protein and no carbs? ›

Some high-protein diets limit carbs so much that you might not get enough nutrients or fiber. This can cause problems such as bad breath, headache and constipation. Some high-protein diets allow red meats, processed meats and other foods high in saturated fat. These foods may increase your risk of heart disease.

Why do I feel so much better on a low-carb diet? ›

Adopting a low-carb diet is one way to help blood sugar (and mood) stabilize. Excess sugar forces our pancreas to produce more and more insulin, a hormone that lowers our blood sugar. If we keep pumping out too much insulin, over time this process can make us resistant to insulin.

Is 100 carbs a day low-carb? ›

While there is no strict definition of a low carb diet, anything under 100–150 grams per day is generally considered low carb. This is definitely a lot less than the amount of carbs in the standard Western diet. You may achieve great results within this carb range, as long as you eat unprocessed whole foods.

Will I lose weight if I dont eat carbs for 2 weeks? ›

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.

How many days can you survive without carbs? ›

Sometimes, a low-carb diet can change the body's metabolic process and can hamper mental and physical health. However, excess carbohydrate is bad for our health but survival without carbohydrate is not possible.

How much weight can you lose by cutting out carbs? ›

People who begin a low-carb diet with less fat to lose generally lose weight more slowly than those who started out with more. After the first couple of weeks on a low-carb diet, people may lose between 1/2 pound and 2 pounds a week, which is considered a more sustainable rate of weight loss.

How much weight will I lose if I cut out all carbs? ›

People who begin a low-carb diet with less fat to lose generally lose weight more slowly than those who started out with more. After the first couple of weeks on a low-carb diet, people may lose between 1/2 pound and 2 pounds a week, which is considered a more sustainable rate of weight loss.

Can you survive without carbs? ›

Severe restriction in long term will result in ketosis; fats are broken down into ketones for energy. Sometimes, a low-carb diet can change the body's metabolic process and can hamper mental and physical health. However, excess carbohydrate is bad for our health but survival without carbohydrate is not possible.

Should I completely cut carbs out of my diet? ›

Snubbing Carbs

You do want to cut down on white bread and white rice, because these and other refined grains are low in nutrients. The U.S. government's guidelines recommend that at least half of your grains are whole grains. Fix it: Don't cut carbohydrates entirely from your diet.

Does the human body need carbs? ›

Your body needs carbohydrates to stay healthy and work properly. The secret is to choose complex carbs more often than simple carbs. Your best bet is to choose mostly nutrient-dense foods with fiber, vitamins and minerals.

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