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Grapefruit Diet

The underlying theory behind the Grapefruit diet is the claim that grapefruits possess a unique fat-burning enzyme that encourages weight loss.

By Zeel Editorial Staff, Last updated: May 18, 2020

Grapefruit Diet Overview

Grapefruits are really, really good for you—at least, that's what fans of the grapefruit diet say. Since its invention in the 1930s, there have been many different versions of the grapefruit diet, but the underlying theory has remained consistent. Grapefruit dieters claim that grapefruits possess a unique fat-burning enzyme that encourages weight loss.

Half a grapefruit or eight ounces of unsweetened grapefruit juice is consumed with every meal on this regimen. Other foods eaten on the grapefruit diet are generally low-cal, low-carb and high in protein. While some versions of the grapefruit diet allow exercise, others insist that the required daily intake of calories is not substantial enough to support physical activity.

When invented: The first mentions of the grapefruit diet stem from the 1930s, though its actual creator is unknown.

Who invented it: Since its emergence, the grapefruit diet has undergone many changes. In 2004, the grapefruit diet gained new notice and popularity with the publication of The Grapefruit Solution: Lower Your Cholesterol, Lose Weight and Achieve Optimal Health with Nature's Wonder Fruit, which was written by Daryl L. Thompson and M. Joseph Ahrens.

Length of diet plan: The grapefruit diet is followed for 12 days at a time. Some versions of the grapefruit diet last up to 18 days. Because the grapefruit diet restricts the amount of calories eaten in a day, it is not a recommended long-term solution to weight loss.

Celebrity Devotees

Kylie Minogue reportedly relies on the grapefruit diet when preparing to slim down for an upcoming music video. Brooke Shields is another supposed devotee. According to the Daily Mail, Jennifer Lopez relies on grapefruit extract to maintain her weight, sniffing (as opposed to eating) the aromatic citrus.

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