Technically, no. But on the other hand, yes. Too much unhealthy food not balanced out with healthy food, after a long time can be bad. That’s how things like diabetes take place. Unhealthy food can also make you gain weight in places you may or may not need it. Just like healthy food can as well. No human can survive just off junk food and no vegetables or anything like that. It may be unhealthy, but it dosnt make us weak right away. Only after weeks and months.