This energy drives bodily processes critical to survival. Cigarettes and alcohol are ok, but marijuana and anabolic steroids. The purpose of this review is to discuss recent findings as they pertain to anabolic and catabolic signaling pathways involved in the regulation of adult skeletal. Define anabolic pathway the phase of metabolism in which simple substances are synthesized into the complex materials of living tissue. Μεταβολή metabolē, change. As I said earlier, I think the legality of these substances is arbitrary. Sustaining chemical transformations within the cells of living organisms. Metabolism breaks down large molecules like food into usable energy.