The grapefruit diet, also known as the Hollywood Diet and erroneously as the Mayo Clinic Diet, is a short-term fad diet that has existed in the United States since at least the 1930s. The diet is based on the claim that grapefruit has a fat-burning enzyme or similar property. The variations of the grapefruit diet that are too low in calories (below 1200 calories a day), carbs or essential micronutrients are considered unhealthy and potentially dangerous. While eating half a grapefruit with every meal may be a good way to incorporate more fruit in the diet of a healthy person, grapefruit and grapefruit juice is harmful if the dieter is taking medications that can interact with grapefruit juice or is allergic to citruses. The grapefruit diet is a low-carb diet. It suggests that grapefruit helps burn body fat when eaten with foods high in dietary fat, which is why the grapefruit diet encourages consumption of meat, eggs and other foods that are rich in fat and protein.
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