hi there, you seem to have an active and healthy child. Almonds walnut and pistacheos are very good source of micronurtrients and minerals besides containing a good percentage of PUFA and being rich in proteins
. They are also a rich source of vit.E, as they are so healthy it is fine to give your son these nuts as snacks about 5 of each varient without worrying about him putting on weight. See to it that he also has a healthy meal containing food items rich in carbohydrates and proteins as he is a growing child and needs them in abundant quantity. A balanced diet is a healthy diet and too much of a good thing is also not good. Take care.