Breakfast: milk 180ml, fresh fruit 1 piece (apple, pear, banana), noodle soup, powder or egg porridge.
Chinese food: one meat, two vegetarian dishes and one soup. Meat should be eaten in meat dishes, not meat foam, at least shredded pork, vegetables in vegetarian dishes, and starchy foods (potatoes) if appropriate. Drink as many soups as possible, such as tomato and egg soup, kelp and ribs soup and other high-calorie nutritious soups. Lunch is the connecting link of people's daily exercise, so we must eat enough.
Dinner: You can simply have a meat meal and a vegetarian meal. You can eat some fruit or something after dinner, but you must still be full.
It's probably the top one. Specifically, you must be a vegetarian every day, an egg every day, and drink milk every day, not too little or too much, or you will get stomach acid. Be sure to eat at breakfast, noon and evening, and try not to eat at other times. Eat beef and mutton at least once a week (autumn and winter). Don't be afraid to get angry. Teenagers only grow for a few years. It's no use making up if they miss it. Don't eat too little because they are afraid of gaining weight. This will do great harm to your health. If you don't want to gain weight, you won't gain weight by eating only the main meal. The key is to cut down on snacks and drinks and exercise properly every day. Go to bed early and get up early for at least 7 hours every day.
In short, teenagers can eat whatever they want, as long as most foods have their nutrition, but they can't overdo it.
Have a nice day.