Originally Posted by Bodhisattva

If you're eating enough calories to be at a surplus, if you're consuming enough protein to rebuild your muscles as they breakdown from exercise, if your body is running optimally by reaching the RDA in Vitamins, Minerals, if you're staying hydrated, if you're sleeping and giving yourself enough time to recover between work outs, and if your exercise routine contains some type of progressive overload: you will gain muscle.

>Source, I'm a Kinesiologist.