Vigorous biking burns a ton of calories, and if you avoid junk food it can really be a chore to eat enough, in my experience. This spring I was riding about 10

Vigorous biking burns a ton of calories, and if you avoid junk food it can really be a chore to eat enough, in my experience. This spring I was riding about 100 miles a week, and I had to eat about 3300 calories a day to maintain my weight. Most days I ate 3 or 4 breakfasts before I started to feel fully awake and alert for the day.