I guess you mean a carnivorous diet based on eating meat for breakfast, lunch and dinner every day, right? Well, in a balanced diet everything depends on the proportions and variety of food on the plate.
I mean, of course, everything in excess is bad. And eating the same thing all the time would be boring for the body.
I believe that a good diet depends on the proteins consumed.
I'm all for a balanced diet- to me, meat all the time isn't balanced, although those on the carnivore diet say you get everything you need!