If it’s pure caloric intake there are plenty of dense fats that will let you do that without having to eat all day. Or your body could create all the proteins you need like silverbacks. Either ways, I’m saying in a sufficiently advanced society there should be enough ways to thread that needle to maintain what you want while modifying the rest. None of this is physically impossible.
No, not physically impossible to have large flying creatures. What I’m suggesting is that by the time you modify a human so they can fly, they’re not really human anymore.
But that may be more of a philosophical debate so I’ll leave it at that.
