This is a key one and where you need to stay focused, Don't eat more calories than your daily recommended amount, for men 2500 and women 2000. You'll be burning more calories than what you are taking in because of the cycling. This is how you'll lose the weight, so it's important that the calories you are taking in are quality ones to repair your body from all the exertion. So that means lots of veg and lean protein sources. Try to get as many of your daily calories from these food groups as possible this will help you burn fat more effectively while keeping your body stocked with all the valuable nutrition it needs. You'll need to eat carbs too the better ones include whole-grains, potatoes and brown rice. white pasta is pretty much empty calories so try to keep eating it to a minimum. you don't have to eat like a health guru every day. Have that pizza if you want it but make sure you don't go over your daily calorie intake this is very important and remember when you do eat bad things instead of good you are slowing down your improvement cycling wise, as your body is not getting the good nutrition it needs to create the new super you. So keep the treat days to no more than twice a week. If you do go over your calorie allowance don't beat yourself up over it but don't make a habit of it either if it makes you feel better you can burn off the extra calories you ate on your next bike ride assuming you didn't eat five pizza!