Activated protein kinase or AMPK for short is an enzyme which acts as a cellular energy sensor. It plays a part in cellular energy homeostasis, notably to activate fatty acids and glucose oxidation and uptake, when cellular energy is low. When activated in some body tissues, it has many beneficial effects. It improves insulin sensitivity, decreases inflammation, stimulates the metabolism and improves muscle performance. AMPK controls and regulates cell survival and growth, cell death and autophagy, meaning it may delay aging.