I can't cook myself. What is the healthiest, safest and cheapest to eat at school?

I have the most experience in this field. If you are fat, you can buy some fruits, such as apples. The calcium content in apples is much richer than that in ordinary fruits, which helps to metabolize excess salt in the body. Malic acid can metabolize calories and prevent obesity in the lower body. Apples have high nutritional value, but we should pay attention to chewing slowly. If an apple can be eaten within 15 minutes, the organic acids and fruit acids in the apple can kill bacteria in the mouth. So eating apples slowly is more conducive to human health. Sometimes you can eat some instant noodles, but it is best to eat them in your own bowl, because the convenience of barrels is the most harmful to your body. If you are greedy and want to eat some meat, it is safer to buy wet ham in the supermarket. If you stay at school, the general canteen should open at 8 pm and you can buy some boiled eggs. Boiled eggs retain all the nutrients of eggs as much as possible, but eating two more eggs a day is very enough.