One way insulin-dependent type i insulin-dependent diabetes is bad for your blood vessels is by creating too much rivalry for an amino acid that helps blood vessels relax, researchers say.That amino acid, L-arginine, is broken down by the enzyme arginase to urea, which helps the body eliminate toxins resulting from the proteins we eat. Diabetics have a lot of arginase activity, which means they use a lot more L-arginine, says Dr.

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