Proposed interactions of diet and lifestyle with skeletal muscle and glucose metabolism. Effects of diet and lifestyle on skeletal muscle mass and function and the impact on blood glucose regulation are explained; diet and lifestyle are shown to exert effects on muscle mass and function, which have interactive effects on glucose metabolism. Sirt 1, NAD-dependent deacetylase sirtuin-1; PGC-1α, peroxisome proliferator-activated receptor-gamma coactivator 1α; mTORC1, mechanistic target of rapamycin C1; S6K1, ribosomal protein S6 kinase beta-1; MAPK, mitogen-activated protein kinase; ERK1/2, extracellular signal-regulated kinases; AMPK, AMP-activated protein kinase; PI3K, phosphoinositide 3-kinase; AKT; NAD+, nicotinamide adenine dinucleotide.