400 kilocalories per day exercise is not large, in general, the daily consumption of calories in adults is: men about 2200-2400 kilocalories; women: 1900-2100 kilocalories. There is basal metabolism, which is the energy consumed by the body in a state of wakefulness and extreme quiet, without the influence of muscle activity, ambient temperature, food and mental stress, etc., and it's different for everyone.

And the calories consumed by an adult per day = the body's basal metabolism + calories used for physical activity + calories needed to digest food. A calorie is a unit of energy. General rough data that: every jogging 1.6 kilometers can burn about 100 kilocalories; 100 grams of corn a stick is equivalent to about 105 kilocalories, etc. 1000 calories = 1 kilocalorie, and we usually verbal "how many calories consumed today" generally refers to the "kilocalorie "

Expanded:

Controlling energy intake and exercising appropriately is a fairly effective method of weight loss, and is viewed by most practitioners The mechanism is quite simple, when the daily energy intake is not enough to provide the body with energy consumption, the body will call on its stored sugars and fats, and when the fats are broken down and provide energy for the body, the weight loss process begins.

But it is still important to note that excessive dieting can be harmful to the gut and digestive system. Some physicians point out that the control of energy intake should be gradual to ensure that the body can slowly adapt, while the daily energy intake is generally no less than 800 calories is appropriate.

Otherwise, the human body will make up for the lack of energy intake by lowering the body's function, which usually results in dizziness, fatigue, and a decrease in basal metabolic consumption that also affects the efficiency of weight loss.