Comment by naijaboiler

In my early to mid 20s. I had to go on intentional ingest nearly 5k a day just to gain 10 lbs. As soon I returned to my regular diet, I lost it all. In my early 40s, I dare not even eat half ass much as I did say 25, I will blow up like a balloon. My own lived experience makes me doubt the universality of that "metabolism doesn't change with age".

Maybe metabolism doesn't change, but my ability to convert what I put into my mouth into weight gain has definitely changed for me. As a young man, I used to eat way much more and poop way much more. It was like the food was just passing through, without really getting in my body. No matter how much i ate Just came right out