How many pounds can you lose on the grapefruit diet?

The grapefruit diet is a popular fad diet that has been around since the 1930s. It is a low-calorie diet that claims you can lose up to 10 pounds in 12 days by eating grapefruit, meat, eggs, and vegetables. But is this extreme diet effective for weight loss in the long run? And how much weight can you realistically expect to lose on the grapefruit diet?

What is the Grapefruit Diet?

The grapefruit diet, also sometimes called the Hollywood Diet or the Mayo Clinic Diet, is a very low-calorie fad diet that promises quick weight loss. The diet plan involves eating grapefruit or drinking unsweetened grapefruit juice with every meal. The reasoning behind grapefruit is that it contains a fat-burning enzyme that supposedly boosts metabolism. In addition to grapefruit, the diet allows eggs, meat, vegetables, and low-calorie dairy like cottage cheese.

Here are the basic rules of the 12-day grapefruit diet plan:

  • Eat half a grapefruit or drink 8 oz unsweetened grapefruit juice before every meal
  • Eat lean protein like eggs, chicken, fish, or beef at each meal
  • Eat lots of low-starch vegetables like salad greens, broccoli, green beans
  • Avoid sugars, carbohydrates, dairy, and fats as much as possible
  • Drink 64 oz of water per day

The diet does not limit portion sizes. It simply focuses on lowering overall calories by avoiding sugary and high-carb foods. There are some minor variations of the diet, but the basic premise of eating grapefruit, protein, and vegetables remains the same.

Does the Grapefruit Diet Work for Weight Loss?

Like other very low-calorie diets, the grapefruit diet will result in quick but temporary weight loss, mostly from losing water weight and lean muscle mass. However, it is an extreme and unsustainable diet for longer than the initial 12 days.

Here are some of the pros and cons of the grapefruit diet for weight loss:


  • Quick initial weight loss in first week
  • Emphasizes fruits and vegetables
  • Low in carbohydrates and sugars
  • Satisfies “sweet tooth” with grapefruit


  • Very low in calories so hard to follow long-term
  • Can cause nutrient deficiencies over time
  • Lack of calories causes loss of muscle mass
  • Does not teach sustainable healthy eating habits
  • Weight lost is often quickly regained

While the grapefruit diet may lead to fast initial weight loss, the extreme calorie restriction is difficult to maintain and can cause rebound overeating. Most health experts do not recommend following fad crash diets for more than a few weeks.

Expected Weight Loss on the Grapefruit Diet

So just how much weight can you expect to lose on the grapefruit diet? Here is a look at the average weight loss during and after the 12-day plan:

Time Period Expected Weight Loss
Days 1-5 2-5 pounds
Days 6-12 3-7 pounds
Total for 12 days 5-10 pounds
1-2 months later Mostly regained

As you can see, most dieters report losing 5-10 pounds over the entire 12-day grapefruit diet. However, most of this initial weight loss is water weight or lean muscle tissue rather than fat.

Unfortunately, the grapefruit diet leads to a rapid rebound effect after normal eating is resumed. Without learning healthy eating habits, dieters often quickly regain most or all of the weight once the grapefruit diet ends.

For more lasting weight loss, health experts recommend aiming for a sustainable 1-2 pound per week loss through balanced nutrition and increased exercise.

Nutritional Concerns

The grapefruit diet severely restricts calories, which can lead to nutritional deficiencies if followed for more than a few weeks. Here are some of the potential health risks of a prolonged grapefruit diet:

  • Low calorie intake: Women are advised to eat at least 1200 calories per day, and men at least 1500 calories. The grapefruit diet provides less than 800-1000 calories for most people.
  • Loss of lean muscle mass: Not enough protein or calories causes the body to break down muscle for energy.
  • Lack of fiber: Without enough whole grains, dieters miss out on belly-filling fiber.
  • Nutrient deficiencies: The diet lacks adequate sources of calcium, vitamin D, iron, and B vitamins.
  • Fatigue and weakness: Too few calories leaves people feeling tired, dizzy, and sluggish.

To avoid negative health effects, the grapefruit diet should only be followed in the short term with a doctor’s approval. Keep in mind that overly rapid weight loss can be dangerous for some people with health conditions.

Making the Grapefruit Diet More Balanced

If you want to try the grapefruit diet, you can take some steps to make it more nutritionally balanced and sustainable:

  • Increase lean protein intake to help preserve muscle mass.
  • Add some healthy fats from olive oil, avocados, nuts or seeds.
  • Include low-sugar Greek yogurt for calcium and protein.
  • Eat plenty of leafy greens for vitamins and minerals.
  • Take a daily multivitamin to help fill nutrient gaps.
  • Drink green tea to help boost metabolism.

Making these modifications provides more balanced nutrition so you can potentially follow the diet a bit longer than 12 days. However, the grapefruit diet is still not ideal for permanent weight loss or health.

Grapefruit Diet Sample Meal Plan

Here is a sample 1200 calorie grapefruit diet meal plan for one day:

Meal Foods
Breakfast 1/2 grapefruit
2 eggs
1/2 cup spinach
1 slice whole wheat toast
1 cup green tea
Lunch 1/2 grapefruit
4 oz grilled chicken breast
1 cup broccoli
1 cup carrots
1 tbsp olive oil
Dinner 1/2 grapefruit
4 oz salmon
1/2 cup brown rice
Snacks 1/2 grapefruit
1 oz mixed nuts
1 cup Greek yogurt

This sample menu provides more calories, protein, healthy fats, and nutrients than a traditional grapefruit diet plan. Customize your own grapefruit diet meal plan based on your food preferences and calorie needs.

Healthier Alternatives for Sustained Weight Loss

For lasting weight loss and health benefits, most nutrition experts recommend alternatives to the grapefruit diet or other fad crash diets. Here are some healthier and more sustainable weight loss options:

  • Balanced deficit diets: Reduce daily calories by 500-1000 to lose 1-2 pounds per week through balanced nutrition.
  • Meal planning: Plan healthy meals and snacks so you stay on track with your diet.
  • Portion control: Use smaller plates and weigh portions to reduce overall calories.
  • High-protein: Eat foods higher in protein like lean meats, eggs, Greek yogurt.
  • Exercise: Add regular cardio and strength training to burn more calories.
  • Hydration: Drink plenty of water to curb hunger and support metabolism.

The key is to develop healthy eating habits you can sustain in the long run, rather than relying on quick fixes. Small consistent changes to your diet and exercise lead to better results over time.


The grapefruit diet promises quick weight loss results. While it may lead to dropping 5-10 pounds in 12 days, most of this initial loss is water weight and lean mass rather than fat. The extreme calorie restriction is difficult to follow for more than a couple weeks and often leads to nutrient deficiencies. Most dieters end up regaining the weight once they resume normal eating. For better long-term weight management, focus on developing balanced healthy eating habits and regular exercise.

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