I just eliminated milk out of my coffee and only drink unsweetened black now (7kj). My weight has stopped creeping up and is now creeping down which I sort of worry a bit about but hey there is plenty of padding around the bum and legs I could do without lol. Walking really is a great exercise. Don't go for the hills, just regular walks. I don't do a lot of exercise but due to my dogs wanting a walk every evening we walk 1.5km and back. They annoy me until I take them so I do. If your horse has too much energy, lunge him first, then ride him at a walk. Teach him to do the fast walking and not the jiggy jog. I had a black stallion once who could really get down and walk fast. His head would be swinging side to side and I think he thought it a challenge how fast he could do it. As in between foods I usually go for fruit and nuts and cut out soft drinks altogether. I eat a pretty good breakfast and since I get out of bed late I usually skip lunch.
