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The Weight Watchers Diet 卡路里饮食法
Philosophy： Portion control. Nothing is off-limits, but everything must be in moderation.
How It Works： Smaller portions mean fewer calories are taken in, so less fat gets stored. A point system assigns a value to portions of all sorts of foods to help tabulate-and limit-daily consumption. To lose half a kilogram a week, you generally need to consume 500 fewer calories a day.
Downside：Hunger. Small portions can leave stomachs growling.
关键词：食量控制。食物不受控制，但限制摄入量。
原理：较少食量，降低摄入热量，减少脂肪囤积。食物卡路里表标明了每种食物的热量值，据此将每日摄入食物做成表格，便于控制。如果想一周减1斤，通常你每天吸收的热量得低于500 卡。
缺点：饥饿。吃得少，你的胃会很难受。
