How much does diet and nutrition actually play a role in development while growing up? I used to be an extremely picky eater and wouldn’t eat anything but junk food. I could down a whole bag of Cheetos and a 2-liter Coke like it was nothing. I eat everything now, but the way I ate before doesn’t really seem to have affected my development growing up. I look completely normal. I’m not overweight, don’t have bad skin or hair loss, and I assume I’m mentally fine since I graduated from college.