You’ve just walked in to your favorite fast food place. You ordered your standard Value Meal #4: hamburger with cheese, french fries, and drink.
When your order comes out everything looks just as it should be, and you dig in. But if someone from the past had traveled in time from 1965 to eat lunch with you, their mouth would be on the floor after seeing the size of your meal. Why would they be freaking out?
Because the average fast food meal is several times the size it was even a few decades ago.