Locations:
Search IconSearch

Will ‘The 100’ Diet Keep the Weight Off?

This low-carb diet limits all sugar calories to 100 a day

tablespoon of sugar and sugar cubes

By: Laura Jeffers, MEd, RD, LD

Advertisement

Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

Imagine a diet where fruit and whole grains can be the bad guys.

It sounds strange, but that’s what “The 100” diet promotes by restricting consumption of sugar calories to 100 per day for quick weight loss.

You can get the general idea from the title of Jorge Cruise’s book, The 100: Count Only Sugar Calories and Lose Up to 18 Lbs. in Two Weeks.

This is basically a super low-carb diet. You may very well lose that weight, but it will be difficult to keep the weight off long-term. If a diet is filled with unsustainable restrictions, weight that comes off fast will be fast coming back on.

A diet that counts all sugar calories

The 100 diet isn’t referring to just refined or added sugar — it means all sugar that comes from carbohydrates, including those that occur naturally in fruit, vegetables, legumes and whole grains. Fiber content and protein aren’t taken into account. The number of total carbohydrate grams is what counts in coming up with the number of sugar calories.

So, in The 100 diet, sugar calories in a food are calculated this way: Total carbohydrate grams X 4 = sugar calories.

How many sugar calories do healthy foods actually have?

Here are a few examples of total carbohydrate grams in some healthy foods, translated into sugar calories:

  • Medium-size apple (3-inch diameter) has about 20 total carb grams. That’s 80 sugar calories.
  • Medium banana has 30 grams. 120 sugar calories. Over the limit.
  • Half-cup of medium-grain cooked brown rice has 22 grams. 88 sugar calories.
  • Half-cup of cooked black beans has 20 grams. 80 sugar calories.
  • Non-fat plain yogurt (1.8-ounce container) has 17 grams. 68 sugar calories.

Advertisement

As you can see, it won’t take much to put you over the daily limit of sugar calories!

Controlling carbs is important — to a point

Most Americans overeat carbohydrates, so watching your carbs is definitely a good idea. But eating a balanced diet is more important, and so is portion control. You can manage weight by eating just about anything — just not overeating.

The 100 diet isn’t dangerous, but it doesn’t supply all the elements you need for a healthy diet. Losing fat so quickly, too, affects electrolytes and your body’s balance. That’s why you should check with your doctor before starting a super low-carb diet like this.

Carbs, healthy fats and protein, and the fiber, vitamins and minerals that you get from lots of fruits and vegetables are all part of a good diet. And so is naturally occurring sugar!

So rather than going on a crash diet, I advise you to take the weight off safely and gradually — 1 or 2 pounds a week. And you’ll have a much better chance of keeping it off.

Advertisement

Learn more about our editorial process.

Related Articles

Food on a plate that fits into a twenty-minute portion of a clock
January 26, 2026/Nutrition
What Is Intermittent Fasting?

Alternating between periods of eating and fasting may benefit your health

Plant-based bowl with marinated tofu, quinoa, chia seeds and greens
January 23, 2026/Heart Health
The What and How of the Portfolio Diet: A Brief Summary

This plant-based eating plan focuses on lowering cholesterol, making it a great companion to the Mediterranean diet

Person spreading peanut butter on soft bread, with glass of milk and bananas nearby
August 4, 2025/Nutrition
How To Follow a Soft Food Diet

Choose foods that are low in fiber and easy to chew and swallow

Filet of grilled salmon on strawberry, cheese, walnut salad
July 1, 2025/Nutrition
The MIND Diet: What To Know

The flexible eating plan aims to boost your brain health by focusing on plant-based foods and limiting saturated fat

Black bowl of grains, salmon, vegetables and boiled egg
June 18, 2025/Nutrition
DASH Diet: What It Is, Meal Plans and Recipes

Designed to lower your blood pressure, this eating plan focuses on heart-healthy foods like whole grains, fruits and vegetables

Hands cutting up a plate of grilled fish over veggies
April 22, 2025/Nutrition
What Is the Pescatarian Diet?

Pescatarians don’t eat poultry, game or red meat, but they do eat fish and seafood, dairy and eggs

Person at table with a bowl filled with fruits and grains
March 26, 2025/Diet, Food & Fitness
What Are the Benefits of Volume Eating?

This eating style has many health benefits, including weight loss, an improved microbiome, and increased nutrient and mineral consumption

Sliced grilled chicken on greens, with avocado and tomatoes
March 18, 2025/Weight Loss
The Best Weight Loss Diets, According to a Dietitian

Research shows promising results from options like the DASH diet and Mediterranean diet

Trending Topics

Person hiking in winter and  having difficult time breathing
Cold Weather and Asthma: Here’s How To Breathe Easier This Winter

Wearing a scarf, adjusting your outdoor activities and following your asthma treatment plan can help limit breathing problems

Marathon runner and their snacks on day of marathon
What To Eat During Marathon Training

Your diet in the weeks, days and hours ahead of your race can power you to the finish line

Person checking cell phone, with another person on the other end
How To Recognize (and Stop) a Guilt Trip

When someone guilt trips you, they’re using emotionally manipulative behavior to try to get you to act a certain way

Ad