I eat like a horse without even noticing; the best way I found to still be able to do that and not gain weight was a low carb diet like Atkins where you burn fat instead of storing it. However, if you're on T it's advisable to limit your fat intake too - you really need to look after your cardiovascular system once on T...
So the best option really would be to get on the healthiest diet you can for your body which would be low carb, low fat, lots of fruit and veg, treat junk food like it's radioactive.