好吧，大家都知道减肥的关键是：节食与锻炼。

Well, so is the key to losing weight: diet and exercise.

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运动与节食结合也许是减肥最有效的途径。

Combining exercise with a diet may be the most effective way to lose weight.

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流行的节食食谱也许能让你远离碳水化合物，吃一大堆葡萄柚也是减肥的秘方之一，而这些之所以有效，全部与卡路里密切相关。

Fad diets may promise you that avoiding carbs or eating a mountain of grapefruit is the secret to weight loss, but it's really all about calories.

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