[QUOTE 5410489, member: 9609"] getting fit seems to greatly increase metabolic rate that sort of means you can et through a lot more calories whilst doing very little.
resting muscle uses something like 4x the energy than resting fat ? (not quite sure what non resting fat is)[/QUOTE]
Take two blokes, both weigh 16 stone. One does a lot of physical work or weight training and is built like a brick outhouse. The other one does a sedentary job and is merely very fat. The muscular bloke has more active body tissue that has to be maintained and supplied with nutrients 24/7 to keep him going, therefore he can get away with eating and drinking a lot more food & beer than the fat but weak bloke who sits in a chair pushing buttons all day.
When I was a kid, there might be one fat kid in the class, who would tend to get a lot of ribbing for it. Now, half of them are like it - because they sit around staring at screens not running about burning off the energy. We used to eat just as much crap as today's kids do, but we were more active.