I've been back to riding for about year & half, I'm 50 yrs old (2000 miles) had to take time off for Prostate surgery but back in the saddle for 5 wks (400 miles) Im eating lite & have lost 40 lbs in 14 months. The problem I have last yr & this year is after about 30+ miles of hard riding my calf muscles are cramping & will stay sore for a couple of days after the ride. I'm in shape & can ride much farther just have the calf pain ?? Is it what I'm eating ? Or what I'm not eating ? Or ???