Nutrition and fibre
What you consume during exercise determines how much you get out of it. If you can't exercise because your body doesn't have carbohydrates available, your progress will be slower.
Healthier gut (better intestinal flora) and thus better immune system, more balanced blood sugar and thus less craving for sweets, better cholesterol levels - what is the secret ingredient?
Many happily tell me that they eat vegetables every day! And that's great. But then they tell me that it's usually tomatoes, cucumbers and lettuce leaves and maybe some peppers.
Here you can really get an advantage over your cycling friends. Because many people think that this part doesn't really matter...