The diet is based on the premise that grapefruit has an enzyme that burns fat, says Andrea N. Giancoli, a spokesperson for the American Dietetic Association, but that enzyme has never been pinpointed.

美国饮食协会的发言人Andrea n . Giancoli说，这种饮食是以葡萄柚含有能燃烧脂肪的酶为前提的，但这种酶从未被准确地找出。

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Andrea Giancoli, a registered dietitian and spokeswoman for the American Dietetic Association, says everyone could stand to eat more fruits and vegetables.

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