Or is it all about suppressing appetite?
The reason I ask, I've been told all my life (often on here) that it is harder to lose weight the older you get, if you eat the same at 50 as you did at 20, even if activity is the same, you'll put on weight. Some women swear menopause causes weight gain, whilst some Drs say it doesn't. I've got some family members on the jabs at the moment that have struggled with their weight later in life, but are doing brilliantly on the jabs and losing weight rapidly.
So does this mean the mechanics are roughly the same with age, eat less, weigh less, and it's the mental aspect that gets harder as we age, not that we physically process food differently?