Sometimes, the body cannot absorb calories properly. Celiac disease and inflammatory bowel disease are the most common, but there are others. The body may lose calories; diabetes causes sugar to come out through the urine. Some infections can cause profound weight loss, such as tuberculosis, HIV, viral hepatitis and parasites.
Your metabolism might indeed be high, but that is not a normal condition of aging. Overactive thyroid disease is a condition your doctor has probably already looked for.
Medications are an uncommon cause of weight loss. Flecainide has been reported to cause weight loss in 1% to 3% of users. Some supplements can cause weight loss, too.
Cancer leaps to the mind for many when they hear about weight loss. Colon cancer and prostate cancer should be considered in any 72-year-old man, but especially with weight loss. The CT scan, if it included chest, abdomen and pelvis, should