Psh, who says a burger is just "veggies, fruit, meat, grains, dairy?" Fruit wtf?? Maybe you don't get fat from eating burgers every 2nd day cause you're young, have a faster metabolism genetically. That doesn't mean it's not bad for you. Some things take years to take hold, think of all the saturated fat from the burger that could eventually clog an artery. You seem to think everything's rated in calories. Junk food has more calories so work out more, OK. To a certain extent, maybe. MAYBE. The body needs certain nutrients to grow, to function correctly. Say you don't get enough vitamin D. Then your body won't absorb calcium and your bones won't grow. The same goes for metabolism. Your body needs protein to build lean muscle, and lean muscle burns the most calories so you lose more fat. If all you eat is junk food, where you gonna get protein from to recover from your workouts??? Your body will take it from the muscles you already have, COUNTERproductive. And if you don't have enough? You'll begin feeling tired and your body will start slowing its metabolism and storing more fat from whatever you eat.
It's a cycle and it all starts with eating wholesome food. Don't be so ignorant about it.
Hummm... I'm not the one being ignorant

! What's the point of giving me a biology lecture? It's not like I don't know that the body needs nutrients... and I already said that junk food is able to cover the daily need of them.
with enough exercise you can eat anything that you want as long as you cover your daily need of vitamins, proteins, minerals etc. which you can easily cover through junk food only.
It's not like there's only unhealthy and bad stuff in it, it's just overrated, or in this case underrated, because of all the fat, sugar and all those other extras that make it taste so yummy and are totally unneccessary for the body. But that doesn't mean that at the same time there are absolutely no vitamins or proteins in it, it's not like you're eating styrofoam with flavor or something.
Anyway, you're trying to tell me the stuff I eat is bad for me but I have been eating junk food since forever, almost on a daily basis, I go to the gym 3-4 times a week and do a forest run for 80 minutes each monday, wednesday and saturday, that's about it. I feel perfectly fine and I haven't been sick for a year.
The reason most people get fat and unhealthy from junk food is that most of them are lazy. Not only too lazy to cook their own food, but also too lazy to exercise which is why they get fat.
I'm not lazy, I just don't have time to prepare a proper lunch because of school so there's no other way for me to get something to eat other than fast food. I hope we are talking about the same thing though, fast food = junk food, right? Btw, do you know what Michael Phelps eats every day? Pizza, chocolate-chip pancakes, toasts with loads of mayonnaise, energy drinks? That's not exactly what I would call healthy food... and that man isn't exactly unhealthy either. Anyway, you keep eating what you want and I keep eating what I want, but I don't think you're going to be any more or less healthy than me.
On the other hand, I don't know what kind of junk food you have in the USA, maybe it's different there.