It is well-known that vigorous exercise does not "work up an appetite." On the contrary, it tends to reduce hunger and appetite.
That might not apply to 8 hours on the Appalachian Trail or a day job as a lumberjack, but it is certainly true for me with my 1-hr daily exercises. The more consistently I exercise, the less interest I have in food and the smaller the portions I can handle. This effect is most pronounced with demanding cardio and calisthenic exercise, not much with strength exercise or with sports. There is a theory that the effect has something to do with Peptide YY.
Nobody wants to eat anything after a hour of tough cardio exercise and that suppressive effect tends to last 24 hrs.
Maybe it makes some genetic sense. If you need to move yourself vigorously and frequently, the less fat you have on you the better you can avoid becoming part of a Tiger Dinner Party. Hunger is an interesting instinct and only recently has it been studied biochemically. One thing we know for certain is that subjective hunger or attraction to food is not a signal for a need for nourishment for most adults in a food-rich environment.
Overweight people seem to have the strongest subjective hunger, and sedentary people tend to have stronger appetites. Cause or effect? Chicken or egg?
