Carbohydrate versus protein The effects of varying the nutrient composition of meals have been studied extensively, rather more for mood than performance. This is largely because of evidence that plasma and brain levels of precursor amino-acids for the synthesis of monoamine neurotransmitters (chemicals responsible for signalling between nerve cells), strongly implicated in mood disorders, can depend on the ratio between carbohydrate and protein in the diet. Synthesis of the neurotransmitter serotonin (or 5-hydroxytryptamine (5-HT)) depends on the dietary availability of the precursor essential amino-acid, tryptophan, owing to a lack of saturation of the rate-limiting enzyme, tryptophan hydroxylase, which converts tryptophan to 5-hydroxytryptophan (see Figure 1). An important complication is that fpF^ LNAA WW
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Studies show obesity may soon overtake tobacco as the leading cause of death in America. Are you ready to drop those extra pounds you've been carrying around? Awesome. Let's start off with a couple positive don't. You don't need to jump on a diet craze and you don't need to start exercising for hours each day.