exercise performance nutrition muscle laurent bannock vitamin d colds sleep immune health guru performance train low body composition fasted training glycogen carbohydrate restriction body fat calories weight management weight loss energy balance infection sniffles immune system sports nutrition immune lifestyle urti flu hiit nitric oxide beet nitrates hit rocket beetroot training high intensity rhubarb spinach blood flow tocopherol adaptation signalling ascorbate stress recovery rns vitamin e vitamin c vitamin a musce cell damage reactive nitrogen species ros reactive oxygen species antioxidants superoxide man flu illness hygiene athlete winter sniffles fatigue buffering beta alanine beta-alanine carnosine sports power creatine monohydrate muscle protein synthesis mps strength hypertrophy creatine metabolic health fat oxidation fat loss
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