Increasing protein intake is not associated with a decrease in kidney function in older adults who don't have kidney disease. However, it can be an issue in people with kidney disease, and some experts recommend limiting protein intake in individuals who have normal kidney function but are at high risk for developing kidney disease. For more details about this, see the Cautions and Concerns section of the Protein Supplements Review.
The Review explains that many older adults do not get enough protein and provides guidelines for protein intake based on your weight and activity level. It also discusses the best time to take protein supplements, our tests of protein products, and identifies our Top Picks for best protein powders, shakes and drinks.