What would you eat?
Total Fantasy Disclaimer : Like say food had no nutritional requirement and was neutral in it's effects, and only existed to give us pure energy. We would also have to assume all foods gave the exact same energy so no hierarchies could exist. 
I personally would eat peanut butter toasties often, not that I don't partake already, but much more often. I would also eat a LOT of Tesco Finest Pizza. I'm not to fussed about sugar but I would gorge on the savouries; cheese, fancy oily crackers and mayo.
I also love salad and would likely compliment this with a mountain of frites or sausage. & OMG SAUSAGE ROLLS!
Maybe I would eat like Elvis, for a short time.
In reality, I love my food and enjoy it, but for health reasons I do opt for moderation, and would probably get tired of excess pretty fast.
Aaaand another disclaimer - this is lighthearted fun.