Muscle mass: Low cretinine is by it self not an issue. From your description you may have a low muscle mass. You need to attend to your nutrition and engage in gradually increasing physical activity to increase your muscle mass. You may wish to try over the counter multivitamins and consult your doctor. See this site for advice on nutrition. http://www.mayoclinic.com/health/balanced-healthy-meals/my02041.
Answered 10/31/2012
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