but wouldn't there be moral aspects of this? Especially when it comes to problems involving the mind?

because there are people who do the whole "dangerous gift" theory... so gene replacement seems bit scary to me O.o

but you are right about food. It's kinda funny how people talk of chemical imbalance and dismiss relevance of nutrition at the same time. Eating right can do a lot good. Though it's not the final answer, imho. Especially if there is REAL reason to feel bad.