Necessity
Steve knows how to make himself a big breakfast that will give him enough energy for a run, with his metabolism this itself is a great feat. If it was about Steve, he could eat breakfast food all day long, especially since he prefers the warm kind, easily be turned into a dinner. His body doesn't seem to mind if he eats fats or sugars or the healthy stuff, but – that's just him.
'Teach me how to cook,' Steve tells Bruce one evening when they are cleaning the kitchen after the meal they shared, just the two of them, since everyone else is scattered across the country at the moment.
He has a boyfriend now, who is a picky eater at best, if he eats at all – unless it's a victory meal or a smoothie. Tony's body has gone through more than it should ever have and really it needs proper care.
'Are you seriously asking me to figure out a dish that's not pizza that Tony will certainly like? 'Cause this is crazy,' Bruce comments, but moves towards the fridge anyway.
'He will eat it if I make it for him,' Steve replies firmly. Whatever it takes.
Tony eats.