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Muscle Primer: What It Is, Why It Matters

Muscle mass is likely the most important tissue in your body when it comes to managing insulin action and blood glucose levels. It is also one of the most important things to maintain to live well and independently as you age. In other words, you can’t afford to lose your muscle mass if you want to live long and well. What exactly is muscle? It’s comprised of about 20 percent protein, with the rest mainly made up of water plus a few minerals and some carbohydrate and fat stores. We generally talk about having two types of muscle fibers, slow twitch and fast twitch, which refers to the speed at which the contractile proteins can do their work and be ready to contract again. Their speed determ

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