I guess something similar to what bodybuilders use, but with high carbohydrate too. So maybe try whey protein/carbohydrate for a supplement?
Other than this, I'd recommend a balance in favour of high protein fish and meats with carbohydrates such as bread, pasta and rice. Milk is also a great source of protein and essential fats. Vegetables and fruit will provide the fibre to keep your digestion ticking along, so don't forget those either.
This is a basic idea, it's just the usual story of a balanced diet - but in this case weight it slightly toward the carbohydrates and proteins (energy foods).
Just don't go buying two dozen krispy kreams. ;)