The person you are responding to isn't necessarily wrong about metabolism being real. I wouldn't say fat people "store more", it's just that if you see thin peo

The person you are responding to isn't necessarily wrong about metabolism being real. I wouldn't say fat people "store more", it's just that if you see thin people eating a ton (and not moving much) and being thin the odds are good that they have a very fast metabolism (by which I mean their base metabolic rate is significantly above the average, to the tune of 4k+ kcal per day). I know this because when I was in university we did at-rest calculations with a hood over the head (to calculate oxygen usage, which we used to calculate BMR). Notoriously thin people had outrageous BMRs like I mentioned, while most people were around the average. I don't know about people who are fat, as I didn't have them in my class.