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There are four key causes of low creatinine: low muscle mass; liver problems; diet; pregnancy or illness; Low muscle mass. Levels of creatinine are often linked with muscle mass or the amount of muscle in the body, which can decrease with age or illness.
Low Creatinine Related to Muscle Mass. When the kidneys are functioning normally, a creatinine level most closely reflects the amount of muscle in the body. Low muscle mass is a leading cause of a low creatinine level. For example, as people age, their creatinine level may decrease as they lose muscle mass -- particularly if they are not exercising regularly.