Picky eating

Hi i’m at my wits end over my son’s eating habit. He has not been eating well eversince he’s 15 months old. Now coming to 2 yrs old, he is picky. He only likes to eat bread, certain fruits,rice, eggs, pancakes and biscuit but not any meat or vege. He has a tendency to throw his food if he doesn’t like. Recently just gave him Pediasure but it doesnt seem to help at all. How do i encounter this issue?