Well first if they are in different physical activities after school they will loss weight depending on what/ how much physical activity there doing. To maintain a healthy lifestyle he/she will need to do some physical activities and eat pretty healthy.
Every cup of fresh strawberries approximately contains 53 grams of carbs. Potatoes are known to contain a lot of it, depending on how many you use. Beans contain around 40g of carbs per serving. On the other hand, oil products for cooking never contained any carbohydrates at all.