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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The U.N. mission's role in Syria was based on the premise that there would be a cessation to the violence, and failing that, "a calibration of effort in response to the situation on the ground would be appropriate, " Ban writes.

CNN: U.N. head outlines options for Syria mission

Some leaked proposals, for example, would authorize member nations, with U.N. blessing, to inspect and censor incoming and outgoing Internet traffic on the premise of monitoring criminal behavior, filtering spam, or protecting national security.

FORBES: U.N. Agency Reassures: We Just Want to Break the Internet, Not Take it Over