Hello, eating oats in the morning can lose weight, but the most important thing to lose weight is to take part in aerobic exercise, not dieting. You can eat oats in the morning, but you can eat them normally at noon, but you can't eat fruit at night. You 18 years old is also a critical period for your body to mature. You can't control your weight too strictly in order to lose weight. I suggest you eat normally at night and eat seven points full. Then, it is best to do aerobic exercise for half an hour every day, such as jogging and aerobics. If you can't hold on, take a walk after dinner 1 hour. Stick to this for 2 months and you will see the effect.