Study Finds Excess Protein May Offer Little Benefit for Sedentary Adults
A review of more than 350 studies suggests that many sedentary people consume more protein than needed, which could have adverse health effects, while active individuals may still benefit from higher intake.
A comprehensive review published in the Cell Press Blue journal examined over 350 studies on protein consumption in humans, mice and other organisms. The analysis indicates that reducing protein intake can lead to weight loss, lower fat mass and improved fasting blood sugar in many individuals, particularly those who are not regularly active.
"It's absolutely crystal clear that there are benefits of protein to muscle growth and exercise response of active individuals," said Dudley Lamming, corresponding author and professor at the University of Wisconsin-Madison, in a news release.
The review also highlighted that excessive intake of certain amino acids—methionine, isoleucine and valine—may raise the risk of obesity, inflammation and other age-related diseases. Conversely, higher protein diets combined with exercise have been shown to support weight loss and mitigate muscle loss in older adults.
Lamming suggested that regular physical activity may offset potential negative effects of a protein-rich diet, noting that athletes and active people are likely to benefit from protein’s role in muscle maintenance. He added that protein recommendations should be tailored to an individual's age and activity level.