GLOSSARY

Nutrient Signaling is signaling in response to nutrient presence or change.

Cellular sensors receive information about energy, nutrients and mechanical loading, and signaling networks coordinate responses. These signals are not all hormones, and activation of one marker does not guarantee greater muscle growth or performance. Practical interpretation requires the signal's magnitude and duration, target tissue, actual nutrient supply and measured outcomes during training and recovery to be considered together rather than treating one molecular response as the final result.

Substrate access, energy status, enzymes, cellular signals and hormones regulate metabolism. Flux control is often distributed across steps; a key enzyme is not the only controller under all conditions. Exercise demand and fed or fasted states alter responses. A regulator's existence does not establish a universal shortcut to faster metabolism or justify more of a nutrient. Interpretation requires pathway context and evidence of the actual effect rather than one mechanistic label.

Meals change uptake, storage, use and hormones; postabsorptive periods increase reliance on stores and endogenous supply. The transition is not an exact clock switch identical for every meal. Mixed foods and recent exercise alter patterns. Athletes should consider session goals, total daily adequacy and tolerance rather than assuming fasted or fed conditions are superior for every outcome. An acute metabolic shift does not directly establish long-term body composition or training benefit.