Can guzzling a protein shake after a workout really make a difference? Published May 25, a new study of people 37 years old or older says yes - a drink containing as little as 20 grams of protein can give your hard-trained muscles a boost. The study involved 16 participants age 37 and older, who ran on treadmills for 45 minutes three times a week for six weeks. After each workout, one group drank a protein shake while the other drank a carbohydrate drink. Scientists took muscle samples at the end of the six weeks, and discovered that the protein group had stronger, fitter muscles, the researchers said.
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