I have no apetite at all after biking for two hours. However, if I drink any diet soda or piece of candy with sweetener, I will be ravenously hungry in 10 minutes. Has always been like this so I stay away from that stuff.

My exercise is a game called Turf. Mostly played in Sweden where there are a lot of zones close by. I bike quite relaxed for 1-4 minuts and stand still for 20 seconds in the zone, then repeat until next zone. It's a bit harder during winter with all the snow though. I have done nothing to my diet and lost about 20 kilo the last year. The GPS says I traveled about 3500 km the last year at my slow pace.

100% this for me. I do intermittent fasting and my first meal is around 2pm. I do brazilian jiu jitsu around 6-9 and skip dinner. When I come home Im not hungry at all for at least an hour. Ill get a little hungry and if I eat or drink anything, the floodgates open and I cant stop eating. It is better to go to sleep a little hungry.

I try to have a 500 calorie deficit. If I have more than about 500 (say 1000) Im fine that day, but the next day Im ravenous and tend to overeat.

Oof this was me yesterday. Ate one large meal and snack between 2pm and 5pm because I had a work event in the evening. Got home around 9:30pm and really wanted to eat something and I almost did.

Drank a few cans of seltzer and wound up staying up doing emails and chores until 2am. Woke up at 9am today and I'm feeling a bit hungry at 11:20am, but even if I eat something now, it will be a net negative compared to what I would have eaten last night.

After a long bike ride, apart from being much hungrier than usual, food tastes better. Mediocre food becomes good, good food becomes the best thing you've ever eaten.

Yeah, that's the way I've felt when I've gone for a hike. The food tastes better and I will happily eat an amount of food that I later regret.

The activity makes a big difference for me though. Running for example tends to not have a major impact on appetite.. sometimes I feel like it actually lowers my desire to eat. That's based on relatively short runs though (45-90 mins of activity). I don't know how I'd feel after a marathon.

If I ride a bike for 3 hours, I feel like I could eat a horse.

This matches my experience. Swimming or biking makes me hungry. Running a reasonably long distance (say, 7+ miles) makes me a slightly nauseous and not hungry at all. Maybe it's because running causes more jostling and/or beats up non-muscle parts of the body more?