MONDAY, July 14 (HealthDay News) -- Cutting just 300 to 500 calories a day from your diet could be the key to slowing the signs of aging and living longer, according to a new study.

Studies have long shown that reducing calorie intake slows the aging process in rats and mice. A popular theory is that fewer daily calories decreases production of the thyroid hormone triiodothyronine (T3), which then slows metabolism and tissue aging.

TUESDAY, May 20 (HealthDay News) -- An investigational smallpox drug may also protect against adenovirus, which causes upper respiratory infections and is one of the many viruses that causes the common cold.

Currently, there are no drugs specifically approved to treat adenovirus. In part, this is because there have been no animal models in which to test new drugs, something that needs to be done before new drugs can be tested in humans.