Based off what? these are ambiguous terms. You can have a varied diet of mcdonalds, taco bell, arbys and wings or eat chicken, eggs and broccoli everyday, the second will be healthier without question.

I think the only thing you might be thinking of is missing out on some nutrients if you really just eat the same things but that is pretty extreme situation. eating meat will get you almost everything you need to function.

unless you have some sources that say otherwise or explain your point better