I come from a family of swimmers. In fact all seven children began swimming training at the age of 5. Twice a day x 6 days per week. I remember one sunday being at the movies watching a Jonny Weismuller movie (Tarzan), and we couldn't stay to watch the whole movie had to go to training !!!!!! At the age of 13 we were allowd to give up, move to another sport, what ever. Anyway I remember coming home from training in the mornings before school and we would have eggs and/or steak.
We were not a wealthy family, but Mum budgeted and fed us well. One of my brothers was an olympic prospect at the age of 8.
He never went to the Olympics in the end, but was top 10 in the world in Tris - way back in the day. Another went on to be a world class runner, and as an aside - his daughter has just swum for NZ in the London Olympics.
Anyway my point is - feed him well, and have plenty of good quality natural foods on hand, and that includes potatoes, kumara, fruit etc....
keep at it - brilliant !!!!!
"never let the truth get in the way of a good story "