Oh God you're a fountain of fanfic ideas. Steve walking around chowing down on oranges out of season because they're so good. He downs cheesecake he could never afford before with joy. Chinese food delivery guys get to know him on a first name basis. "I can eat anything and I'll never have consequences" + everything is available + SHIELD picking up the tab = Steve eating out of a tub of Hagen-Daahz while Tony wonders if Steve's pregnant.

My first boyfriend downed several gallons of sutei tsai (salty milk-tea; it's an acquired taste) in the name of keeping me happy. Presumably when Tony is actually in love and not just attracted he'd be like, "Cheese. Sweet. Thanks!"