i mean we do have that moment in chapter 12 where taehyung is inhaling like 3 muffins for breakfast and jeongguk is making his freaking protein shake (i feel like he did eat a muffin too tho it was just off scene 😌) i guess as an athlete he's pretty tuned into what he needs to be eating in order to be able to perform best and he's a liiiiittle obnoxious about it maybe but as we've seen: if taehyung wants pizza they'll be getting pizza (or whatever else he wants lbr)