If you want to have a body like a runner or rock climber, keep eating Clif Bars. For building muscle, you need a better bar. The best I've used are VPX Zero Impact bars, they are a bit more expensive but you get what you pay for. Zero Impact Bars are high in protein, low simple sugar content and very few additives and preservatives. Other great bars are made by Labrada, MET-Rx and World Wide (brand name Pure Protein). Met-Rx and Worldwide are both owned by the same parent company so their bar formulas are very very similar to eachother.