My Grandson Is 8 Yo Weighing 4stone.Hes Always Had A

My grandson is 8 yo weighing 4stone.Hes always had a good appetite and has eaten a good diet ie plenty veg fruit etc.never eaten a child's diet of chips,nuggets and the like. He's happy at school,no problems at home.He now plays football 2/3 times a week.Hes not ill. suffers with colds as all children do but nothing to be alarmed about.For a couple of weeks now he's become a poor eater picking and leaving food saying "I'm full" If I was to get a tonic such as Metatone would this help bring his appetite back.This is what my mother use to give me .She always said it worked. Thanks