It’s possible to eat reasonably healthy at McDonald’s or other fast food restaurants. But a lot of people are going to add fries and a sugary drink, or even a milkshake, exploding the calories to unreasonably high amounts. If you just have it every now and then, whatever, it’s not going to kill you. I used to eat McDonald’s a lot when I was younger and it was actually cheap. Their prices are so ridiculous now that you may as well just buy something that actually tastes good instead.