No, the big mac was never the size of a whopper. I don't think it has changed much at all. Look it up.

What did change was when McDonalds was well worth it: 5 cheeseburgers for a buck. But that was the 50's.

I don’t remember how much McDonalds cost in the 70s. kids tend to not retain that information.

Thing is do remember this. In 1978 I could get a burger from a place called The Duck Inn for 75 cents. It was huge and delicious. At that same place a chicken dinner was $1.50.

Here is a picture of the place https://www.shorpy.com/node/20743

Amazingly The Duck Inn is the only restaurant costs I remember from my childhood, because the place was two doors down from where my family and I lived.

I went to college in the 80s and started to learn about nutrition and the environment and found out how shitty fast food was/is.

McDonald’s didn’t turn to shit in the 80s. It always was shit.