It is not enough to simply purchase foods that are high in complex carbohydrates, fiber, good sources of protein, and low in saturated fats. food must also be

Organically produced is probably the answer. However, this answer is questionable and could be in some cases also considered to be controversial as there is little strong evidence that actually favors organic food compared to conventionally grown food. 

He will get sick right away , he will have low energy , he will loose all his nutrition