Your body doesn't know what day it is. When you eat a whole pepperoni pizza, you're not cheating a diet—you're giving your mitochondria and metabolism a massive data point. Every bite counts, every day.
Cheat days are fake. They don't exist. If you smash a pepperoni pizza, if you take down that bad boy in one go, that's not a cheat day from your diet. That is your diet. And what I mean by this is your mitochondria, your metabolism, your muscles, they don't care what day of the week it is, and they don't care what you label things. Every bite is information for your body. Food is information. So make an informed choice. And if you choose as an adult to eat a whole pepperoni pizza, just know what you're doing to yourself. There are no cheat days.