Normal body mass index is 18.5 ~ 23.9. After investigation, it is proved that when the body mass index is 22 years old, people are the least sick.

Your body mass index = 51÷ (1.61*1.61) =19.675 is very good.

You 14 years old, growing up, ensure a correct nutritional diet, and resolutely do not follow the trend of dieting easily. Personally, I suggest you eat three meals normally, don't go on a diet, and be healthy. 95% of food is natural, such as rice, poultry, eggs, vegetables and fruits. Instead of fried things, desserts, unnatural drinks (such as soda drinks like cola) and so on.

Adhere to moderate exercise, at least twice a week, for more than 30 minutes each time. When you are tired of reading, go jogging or something, and combine work and rest. If you are too busy studying, squeeze out five minutes of spare time every day to disperse your exercise, such as standing on one leg every 30 seconds when you get up early to brush your teeth, climbing stairs without taking the elevator, cleaning your room after dinner or going out for a walk, and kicking your legs in bed before going to bed.

If you have a double chin, massage with your hands before going to bed every day. Wrap one hand around your chin and push it down to your collarbone. Repeat this action for about 3 minutes, not too hard.