Way back when I was a kid, we ate at a restaurant about once a year. Soda was for the holidays. About once a month, we'd get to go to a convenient store and get a slushy. Halloween was a big deal because that's when we'd get candy.
By the time I was in high-school and skateboarding all over the place, I started grabbing a hot dog (they were cheap) while I was out and maybe a fruit pie. I did this because where we moved didn't have apple trees (which we used to eat all day while we were out playing). Somehow, soda for most people I knew became a weekly affair.
Fast-forward a coupla decades....now soda isn't even a daily affair, it's what people drink all day. Candy is for multiple daily snacks (often replacing a proper meal), and I know kids who think hitting their favorite fast food place on the way to school and again on the way home is a god-given right. I watched a kid getting their music lesson where I teach get mad at his mom because they were going straight home instead of to McDonald's.
Re-wind to 10,000BC: Dude is munching his raw meat, staying warm by the fire. Dude is playing around and sticks hunk of meat over fire. It sizzles. He munches a bit of the burnt edge. YUM! Does this once a month or so for a treat, but knows instinctively you don;t wanna do this all the time. Looks over at his mate who is feeding the baby....
Fast-forward to when baby is now 15. Spoiled brat who sizzles his meat every day and mouths off when dad says "stop that!".
The wheel turns.....