The authors claim that evidence is showing that restricting protein intake has benefits for metabolic health, healthspan, and lifespan. A new study pushes back on the notion that higher amounts of protein help stave off the ravages of aging. The research also comes as shoppers embrace increasing their protein intake and food makers respond by packing protein into more and more products. However, they contend that more and more evidence is showing that restricting protein intake has proven benefits for metabolic health, healthspan, and lifespan across diverse organisms. Older adults, for example, are often told to up their protein intake and exercise to battle sarcopenia and frailty.