Research into the potential benefits of protein restriction for aging and longevity has shown promising results in animal studies, but scientists are urging caution when considering these findings for human diets. Studies in yeast, fruit flies, mice, and rats have demonstrated that restricting protein intake can extend lifespan. However, experts emphasize that this does not automatically translate to humans.
Christopher D. Morrison, a professor at Louisiana State University’s Pennington Biomedical Research Center, whose lab identified the hormone FGF21 as a key component in how mice respond to protein restriction, stated that the extension of lifespan observed in animals may not occur in humans. FGF21 levels have been observed to increase in people following a protein-limited diet.
Further research is needed to understand the specific impact of protein restriction on humans, particularly concerning its effects on exercise performance and the varied needs of different age groups. Current studies in humans have been limited in scale and duration. Scientists also point to potential negative consequences of very low protein diets, including impaired immune function and reduced bone density.
It is important to note that protein restriction studies in animals often involve extreme dietary limitations, while human studies typically examine more moderate dietary adjustments. The scientific consensus suggests that while moderate protein restriction may offer health benefits, extreme restriction approaching malnutrition is not recommended for people. The differing protein requirements among individuals also suggest that a one-size-fits-all approach to protein intake is unlikely to be effective for promoting longevity or health.