Insulin aids the absorption of proteins and other vital nutrients into your cells (specifically carbohydratse). Most bodybuilders eat within 1 hour of their workout since they're glycogen and other energy stores have been depleted and your insulin becomes very sensitive since it wants to replenish the muscles with fuel. This is a window of opportunity to ship in a lot of protein very quickly (as well as carbohydrates). What type of diabetes do you have?
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