Thursday, 28 March 2013 23:01. Tweet. Do you love your chocolate but think it is having a negative effect on your running....think again, as some evidence suggests that consuming moderate amounts of chocolate could actually boost your performance during exercise and may also help improve your recovery afterward.n a study published in 1996 in “Biomedical and Environmental Sciences,” 16 male college-age students who ate a chocolate bar before a moderate-intensity run had higher blood sugar levels 15 minutes into their run and all the way through 30 minutes after their run than when they had a placebo supplement.