What the hell are you babbling about? Given sufficient calories, tuna and beans works great for building mass.
well
protein and "carbs" (do you want to call beans a carb..? they are in between vegetable and carb really...not enough glucose to be starch, but not enough fiber or vitamin/mineral to be veggie (and yes i know they are legume but that isnt what im talking about) )
sure protein and carbs is great for losing fat
protein and ALOT of carbs and a bit of fat would be good for building muscle
that meal is a little bti of carbs, a little bit of fat, and a moderate portion of protein...however its tuna... tuna has fat and guess what ? omega 3 fat... anti inflammatory... not good for building muscle.. more fish fat = less response to/growth from training...