Boys can become thinner by improving their diet, regularizing their work and rest, and increasing the amount of exercise. 1. Improve diet: diet should be light, avoid eating spicy stimulating, high sugar, high fat food, eat more green leafy vegetables, eat more coarse grains, drink more water, avoid drinking sugary drinks. 2. Regular work and rest: avoid staying up all night, staying up all night makes people anxious, so they may eat more, which will make people fat. Staying up late can also lead to endocrine disruption, which can lead to obesity. 3. Increase the amount of exercise: you can usually do some aerobic exercise, such as walking, swimming, running, etc., to increase the usual amount of exercise, so that the body fat is gradually consumed, so that the body becomes thin. Aerobic exercise should be persisted for a long time. If hypothyroidism and other diseases lead to obesity, you also need to consult a doctor in time, follow the doctor’s instructions for treatment.