As you age, it becomes harder to keep your muscles healthy. They get smaller, which decreases strength and increases the likelihood of falls and fractures. New research is showing how this happens, and what to do about it.
Researchers have already shown that when older people eat, they cannot make muscle as fast as the young. Now they've found that the suppression of muscle breakdown is blunted with age. This may explain the ongoing loss of muscle in older people -- when they eat they don't build enough muscle, and in addition, their insulin fails to shut down the muscle breakdown that rises between meals and overnight.
However, weight training may "rejuvenate" muscle blood flow and help retain muscle for older people.