Suggestion: Calorie is a unit to measure calories in food and drink. The psychology of losing weight is also very important. The body needs energy to support our daily basic activities. Typing, walking and even breathing require heat. Maintaining weight also requires energy consumption. If a person eats less or consumes more calories, it will lead to weight loss and loose skin. This is called calorie deficiency. There is a golden rule: less than 3500 calories will make people lose about a catty. 2. How many calories does a person need? There are several ways to calculate a person's daily calories. The first is the resting calorie consumption formula, which is used to measure a person's resting metabolic rate. The other is to calculate calories: input weight, activity intensity and weight loss goal, and you can get a recommended energy intake. Knowing how much energy you should consume, you can control your eating habits for a day to lose weight according to your own goals. Remember: you can lose a pound if you have less than 3500 calories. Many people can save 250 to 500 calories a day. Remember: if you consume less than 1200 calories a day, your health may be threatened. 3. How many calories are there in each food? The next step is to learn to read the labels on the outside of food bags and calculate the calories contained in each food, which can be calculated by computer. Foods bought in stores are generally marked with food nutrients. You can know how much nutrition and calories food contains. How many calories a serving of food contains will be labeled. Remember to see how much a copy costs. Different foods have different units of measurement. You can also use the second method of calculating calories to search the calories contained in common foods on the Internet.