Thanks guys for your input. I have been biking quite regularly since we have had a relatively snow-free winter. For lunch I just had a bag of peanuts and raisins and water! It wasn't much food at all and so I don't know if that would be a factor. It is possible that I am pushing myself too hard and I do tell myself to relax and enjoy the scenery. I heard from someone that I should avoid taking a break all together because stopping allows lactic acid to build up???? Thoughts?