|Figure 1: Zinc supplements |
are a bodybuilder's favorites
Fasting serum insulin and HOMA2-IR increased (27% and 47%, respectively) on day 60 compared to baseline (p = 0.03), suggesting a delayed effect of zinc supplementation. Moreover, plasma zinc was positively associated with serum insulin (r = 0.87, p = 0.009) and HOMA2-IR (r = 0.81, p = 0.03) after zinc supplementation (day 30), indicating that supplemental zinc may impair glucose utilization in cyclists.
If this happens in endurance athletes, in bodybuilders, who are always scared they'd lose muscle if they do cardio, the increase in insulin could become problem. If, in addition, you follow a high carb diet and down a few scoops of a weight gainer every other day, you are probably in for trouble. So better keep your zinc supplementation within reasonable limits; plus, if in doubt leave it out ;-)