The legendary grapefruit diet promised weight-loss results if you ate grapefruit or drank grapefruit juice before every meal.
Drink Grapefruit Juice Before Meals
Have a watery snack, such as grapefruit juice, about 20 minutes before your main meal to potentially help give your diet more impact. This effect was demonstrated when researchers from Vanderbilt University had 85 participants follow a low-calorie diet for two weeks.
Use Grapefruit Juice to Manage Insulin Levels
A premeal glass of grapefruit juice may also have a notable impact on insulin, a hormone that impacts your blood sugar levels and plays a role in fat storage. In a study of 91 people, those who drank 8 ounces of grapefruit juice before each meal, three times a day, lost 3 1/2 pounds over the course of 12 weeks even though they weren’t specifically prescribed a low-calorie plan.
Follow a Low-Calorie Diet and Exercise for Weight Loss
Even if you add grapefruit juice before meals, you’ll still need to eat fewer calories than you burn to lose weight. Use an online calculator to estimate your daily calorie needs to maintain your current weight.
Add Grapefruit Juice Thoughtfully
Grapefruit juice averages about 100 calories per 8-ounce serving. If you do drink it prior to meals, make sure you account for it in your total daily calorie intake. Otherwise, the extra calories could inhibit weight loss or — worse — cause weight gain.