Can a low-carb diet help you lose weight? (2024)

Low-carb diet: Can it help you lose weight?

Could a low-carb diet give you an edge in losing weight?

By Mayo Clinic Staff

Definition

A low-carb diet limits carbohydrates, often called carbs — such as those found in grains, starchy vegetables and fruit. A low-carb diet focuses on foods high in protein and fat. Many types of low-carb diets exist. Each diet has varying limits on the type and amount of carbs you can eat.

Purpose

A low-carb diet is generally used for weight loss. Some low-carb diets may have health benefits beyond weight loss, such as lowering your risk of type 2 diabetes and metabolic syndrome.

Why you might follow a low-carb diet

You might choose to follow a low-carb diet because you:

  • Want a diet that limits some carbs to help you lose weight.
  • Want to change your overall eating habits.
  • Enjoy the type and amount of food used in low-carb diets.

Check with your health care provider before starting any weight-loss diet, especially if you have any health conditions, such as diabetes or heart disease.

Diet details

A low-carb diet limits the amount of carbohydrates you eat. Carbs are grouped as:

  • Simple natural, such as lactose in milk and fructose in fruit.
  • Simple refined, such as table sugar.
  • Complex natural, such as whole grains or beans.
  • Complex refined, such as white flour.

Common sources of natural carbohydrates include:

  • Grains.
  • Fruits.
  • Vegetables.
  • Milk.
  • Nuts.
  • Seeds.
  • Legumes, such as beans, lentils and peas.

In general, you digest complex carbs more slowly. Complex carbs also have less effect on blood sugar than refined carbs do. They also offer fiber.

Refined carbs such as sugar or white flour are often added to processed foods. Examples of foods with refined carbs are white breads and pasta, cookies, cake, candy, and sugar-sweetened sodas and drinks.

The body uses carbs as its main energy source. During digestion, complex carbs are broken down into simple sugars, also called glucose, and released into your blood. This is called blood glucose.

Insulin is released to help glucose enter the body's cells, where it can be used for energy. Extra glucose is stored in the liver and in muscles. Some is changed to body fat.

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

Typical foods for a low-carb diet

In broad terms, a low-carb diet focuses on proteins and some nonstarchy vegetables. A low-carb diet generally limits grains, legumes, fruits, breads, sweets, pastas and starchy vegetables, and sometimes nuts and seeds. But some low-carb diet plans allow small amounts of fruits, vegetables and whole grains.

A daily limit of 0.7 to 2 ounces (20 to 57 grams) of carbohydrates is typical with a low-carb diet. These amounts of carbohydrates provide 80 to 240 calories. Some low-carb diets greatly limit carbs during the early phase of the diet. Then those diets allow more carbs over time.

In contrast, the Dietary Guidelines for Americans recommend that carbohydrates make up 45% to 65% of your total daily calorie intake. So if you eat or drink 2,000 calories a day, carbs would account for between 900 and 1,300 calories a day.

Results

Weight loss

Most people can lose weight if they limit calories and boost their physical activity. To lose 1 to 1.5 pounds (0.5 to 0.7 kilograms) a week, you need to eat 500 to 750 fewer calories each day.

Low-carb diets, especially very low-carb diets, may lead to greater short-term weight loss than do low-fat diets. But most studies have found that at 12 or 24 months, the benefits of a low-carb diet aren't very large.

Cutting calories and carbs may not be the only reason for the weight loss with low-carb diets. Some studies show that you may shed some weight because the extra protein and fat helps you feel full longer. Feeling full longer helps you eat less.

Other benefits

Low-carb diets that focus on healthy sources of carbs, fat and protein may help lower the risk of type 2 diabetes and heart disease. In fact, almost any diet that helps you shed excess weight may improve blood sugar and cholesterol levels, at least in the short term.

Risks

A sudden and large drop in carbs can cause short term side effects, such as:

  • Constipation.
  • Headache.
  • Muscle cramps.

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. If you limit carbs in the long term, it may cause you to have too little of some vitamins or minerals and to have digestive issues.

Some health experts think that if you eat large amounts of fat and protein from animal sources, your risk of heart disease or certain cancers may go up.

If you opt to follow a low-carb diet, think about the fats and proteins you choose. Limit foods with saturated and trans fats, such as meat and high-fat dairy products. These foods may make your risk for heart disease go up.

From Mayo Clinic to your inbox

Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. Click here for an email preview.

To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail.

Nov. 15, 2022

  1. Ebbeling CB, et al. Effects of a low carbohydrate diet on energy expenditure during weight loss maintenance: Randomized trial. BMJ. 2018; doi:10.1136/bmj.k4583.
  2. Raynor HA, et al. Position of the Academy of Nutrition and Dietetics: Interventions for the treatment of overweight and obesity in adults. Journal of the Academy of Nutrition and Dietetics. 2016;116:129.
  3. Duyff RL. Carbs: Sugars, starches, and fiber. In: Academy of Nutrition and Dietetics Complete Food and Nutrition Guide. 5th ed. Houghton Mifflin Harcourt; 2017.
  4. Westman EC, et al. Using a low-carbohydrate diet to treat obesity and type 2 diabetes mellitus. Current Opinions in Endocrinology, Diabetes and Obesity. 2020; doi:10.1097/MED.0000000000000565.
  5. Gepner Y, et al. The beneficial effects of Mediterranean diet over low-fat diet may be mediated by decreasing hepatic fat content. Journal of Hepatology. 2019; doi:10.1016/j.hep.2019.04.013.
  6. 2015-2020 Dietary Guidelines for Americans. U.S. Department of Health and Human Services and U.S. Department of Agriculture. https://health.gov/dietaryguidelines/2015/guidelines. Accessed Oct. 22, 2020.
  7. Kirkpatrick C, et al. Review of current evidence and clinical recommendations on the effects of low-carbohydrate and very-low-carbohydrate (including ketogenic) diets for the management of body weight and other cardiometabolic risk factors: A scientific statement from the National Lipid Association Nutrition and Lifestyle Task Force. Journal of Clinical Lipidology. 2019; doi:10.1016/j.jacl.2019.08.003.
  8. Perreault L. Obesity in adults: Dietary therapy. https://www.uptodate.com/contents/search. Accessed Oct. 22, 2020.
  9. Freire R. Scientific evidence of diets for weight loss: Different macronutrient composition, intermittent fasting, and popular diets. Nutrition. 2020; doi:10.1016/j.nut.2019.07.001.
  10. Shan Z, et al. Association of low-carbohydrate and low-fat diets with mortality among US adults. JAMA Internal Medicine.2020; doi:10.1001/jamainternmed.2019.6980.
  11. Evert AB, et al. Nutrition therapy for adults with diabetes or prediabetes: A consensus report. Diabetes Care. 2019; doi:10.2337/dci19-0014.
  12. Gordon B. What is the ketogenic diet? Academy of Nutrition and Dietetics. https://www.eatright.org/health/weight-loss/fad-diets/what-is-the-ketogenic-diet. Accessed Nov. 11, 2020.

See more In-depth

Products and Services

  1. The Mayo Clinic Diet Online
  2. A Book: The Mayo Clinic Diet Bundle

See also

  1. Artificial sweeteners and other sugar substitutes
  2. Atkins Diet
  3. Coffee calories
  4. HCG diet
  5. High-protein diets
  6. South Beach Diet
  7. Weight-loss options
  8. Energy density

.

Can a low-carb diet help you lose weight? (2024)

FAQs

Can a low-carb diet help you lose weight? ›

Weight loss

How much weight can I lose in a week on a low-carb diet? ›

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.

Will a low-carb diet help me lose weight? ›

The number of calories you eat can affect your weight gain and loss. One of the main reasons low carb and ketogenic diets lead to weight loss is that they reduce appetite and make you eat fewer overall calories without trying.

Does low-carb help lose belly fat? ›

Cut back on carbs — especially refined carbs

Some research suggests that replacing refined carbs with unprocessed starchy carbs may improve metabolic health and reduce belly fat ( 34 , 35 ).

How many carbs should I eat a day to lose weight? ›

As far as how many carbohydrates to eat, Pratt says 100 to 150 grams of carbohydrates is safe for most people who are trying to lose weight. It may be better for some people to eat carbs consistently throughout the day. “You can also break it up evenly with 40 to 50 grams of carbs per meal,” she says.

How long does it take to see results from a low-carb diet? ›

Within one to two weeks of starting the diet, users usually see the biggest weight loss. Why does this happen? First, when insulin drops, the kidneys remove extra sodium from the body. Second, when someone restricts their carb intake, glycogen — the stuff that keeps extra water in the organs — also goes down.

What happens when you cut carbs for 2 weeks? ›

You'll Lose Water Weight

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.

How fast can I lose 20 pounds on low-carb? ›

Keto Weight Loss Results After 90 Days on Keto

“If the patient can maintain a steady calorie deficit, I expect them to lose one to two pounds per week,” says Dr. Seeman. So after 12 weeks, her clients are usually down around 20-25 pounds.

What happens if I eat no carbs for a month? ›

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.

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.

Can you lose weight on 50 carbs a day? ›

You may lose weight faster on 50 g of carbs a day or less, but it depends on what else you're eating, how many calories you're consuming, how active you are, and many other factors. In addition, eating slightly more carbs may lead to lower but more sustainable weight loss.

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.

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 cutting carbs flatten the stomach? ›

Limit your intake of refined carbs

More specifically, studies show that low carb diets may help reduce visceral fat and belly fat in some people. However, you don't have to cut out all carbs to reap the benefits, especially if a low carb diet is not ideal for your personal health history.

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.

What are the side effects of a low-carb diet? ›

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 are the healthiest carbs for weight loss? ›

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. Starchy vegetables: Potatoes (preferably with the skin), green peas, corn and winter squash like butternut or spaghetti squash.

What carbs should you avoid to lose weight? ›

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.

Where do you notice weight loss first? ›

However, some research suggests that men typically lose weight in their abdominal area, while women tend to see more weight loss in their hips. Women in postmenopause and men in middle age, in particular, tend to gain weight around their abdomen, which suggests they may see weight loss in this area at first.

How much weight can you lose in a Month Low carb? ›

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 is the number one worst carb? ›

Sweetened beverages like soda and fruit juice are loaded with sugar and very high in some of the worst carbs to eat. Note that diet drinks made from artificial sweeteners may contain no carbs but are likely no more healthy in the long term, and they also contribute to weight gain.

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

Reducing your intake of calorie-dense carbs automatically reduces the amount of calories you're consuming on a daily basis, which forces your body to burn fat stored around your midsection for energy, rather than the sugars it takes from carbohydrates. Eat This!

How long does it take to lose 10 pounds on a low-carb diet? ›

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. At first, there may be a quick drop in weight, but it's mainly due to water loss.

How do I lose 10 pounds in a week? ›

To lose 10 pounds in one week, you'll need to burn between 3,500 and 5,000 calories more than you consume each day by restricting your diet to small portions of nutritious yet low-calorie foods, and significantly increasing your aerobic exercise with interval training, sports, and other vigorous activities.

What are the results of the 1 week no carb diet? ›

Anecdotally, people report losses within the first week of anywhere from 1 pound (0.5 kg) to 10 or more pounds (5 kg). The larger you are, the more water weight you're likely to lose after starting keto. Although, it's unlikely that much of this initial weight loss is fat loss.

How much weight can you lose in the first 2 weeks of a low-carb diet? ›

The amount of weight you can lose on a low-carb diet in 2 weeks can vary widely depending on factors such as your starting weight, adherence to the diet, and individual metabolism. Some individuals have reported losing up to 10 pounds or more in two weeks, while others may experience less dramatic results.

Top Articles
Latest Posts
Article information

Author: Arline Emard IV

Last Updated:

Views: 5762

Rating: 4.1 / 5 (52 voted)

Reviews: 83% of readers found this page helpful

Author information

Name: Arline Emard IV

Birthday: 1996-07-10

Address: 8912 Hintz Shore, West Louie, AZ 69363-0747

Phone: +13454700762376

Job: Administration Technician

Hobby: Paintball, Horseback riding, Cycling, Running, Macrame, Playing musical instruments, Soapmaking

Introduction: My name is Arline Emard IV, I am a cheerful, gorgeous, colorful, joyous, excited, super, inquisitive person who loves writing and wants to share my knowledge and understanding with you.