I've found that when I start feeling hungry, like right before dinner, is a great time to exercise. The act of exercising makes me non-hungry for a while - like maybe 30 minutes after exercise ends.
Both cycling and day hikes keep me away from home, and away from the fridge. If I start at say 10 AM until 3 PM, basically I'm missing lunch, so I'll take an energy bar or something, but that bar is less calories than a normal lunch and/or snacks. On day hikes, I might be out even longer, like from 10 - 6, and never stop for fast food.
Cycling also helps with motivation. When I commit to cycling, and really get into it, then I really want hills to be easier... which motivates me to watch diet and eat less. As a 6' 4" guy when I went from 225 to 190, hills became so much easier to get over at the lighter weight. It was the difference between feeling nauseous after steep hills vs. feeling pretty competent on the bike. It's so much more enjoyable to ride at a lower weight.