Don't take any calories on your ride. Just water or zero calorie drinks. If your goal is weight loss, you don't need to eat while exercising. Also, exercise on an empty stomach. If you ride in the morning, don't eat breakfast. Don't eat immediately after a ride either. Let your body burn calories that are already there. Intermittent fasting works for a lot of people. Eating 4-5 smaller meals is generally better than eating 3 big meals. Skipping meals is good also. Our bodies have kind of been programmed to eat in the morning, around noon, and then at night. It won't kill you to skip a meal or two. These are just some easy techniques to limit eating that have worked for me in the past. Oh, and as you get older, weight loss gets more difficult.