A cyclist friend of mine asked me a question that I couldn't answer so I turn to all of you. He asked me if his daily diet needs to be increased as he started cycling a short while ago. He rides three days a week, one hour each day, at nothing more than a moderate pace of 15 mph average with a heart rate of 135 to 140 bpm with a mhr of 187 bpm. He is currently taking in approx. 1800 to 2000 calories a day. He said that his weight is staying the same but is concerned that perhaps his body has adjusted to his daily caloric intake and worries that he might not be getting in enough nutrients. Thanks for the help.