My appetite returned between the 8th and 9th post-op month. Activities that decrease my cravings and hunger include aerobic exercise (e.g. running, jogging, bicycling, hiking, stair climbing) and drinking caffeinated coffee. Caffeine cuts my appetite dramatically, even though some people may be opposed to it.
Activities that cause me to feel hungrier include weightlifting and watching television. While I'll continue to lift weights, I've greatly curtailed my TV-watching because it promotes a sedentary life.