What most people think of as a calorie is actually a kilo-calorie: It takes one calorie to raise the temperature of 1 kilogram of water 1 degree Celsius.
很多人认为的一Calorie实际上是指一千卡：即指一千克水升高一摄氏度时所需要的热量。
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Aim to lose 1 to 2 pounds (0.5 to 1 kilogram) a week. To do this, you need to burn 500 to 1, 000 calories more than you consume each day, through a low-calorie diet and regular exercise.