Kindly normalize your routine. The longer you don't eat the less hungry you will feel, it's normal. Start with a glass of fresh lemonade and toast with butter and jam for breakfast if you don't want to eat anything heavy. Eat some home-made fries/apple/cucumber or a box of yogurt for lunch in the school of you can't prepare a healthy sandwich or don't wanna eat from the canteen. Eat with smaller more frequent meals. Take 1 TBSP syrup lysovit daily.
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You can seek further professional help from the below recommended Specialists: