Older adults need twice as much protein per meal as younger adults to get the same amount of muscle protein synthesis. That’s because muscles become less sensitive to amino acids in response to protein intake, a phenomenon known as anabolic resistance. Most people think this is due to aging, but physical inactivity is the real culprit. People are less active as they get older. Only about 30% of young adults and just 20% of older adults regularly engage in some form of resistance training. Older