Many food products today are packed with extra protein. You can now find protein in cereals, bread, yogurt, chips, drinks, and even coffee. These products often promise stronger muscles and better health.
Because of these claims, many older adults believe eating more protein is the best way to stay strong. Muscle strength naturally decreases with age, so it is easy to understand why protein supplements have become so popular. However, new research from Tufts University suggests that extra protein may not be the answer for healthy older adults.
The study, published in the American Journal of Clinical Nutrition, found that simply adding whey protein to the diet did not improve muscle strength. Instead, researchers say regular exercise, especially strength training, remains the most effective way to maintain muscle health during aging.
As people get older, they slowly lose muscle mass and strength. This process often begins around the age of 40 and continues over time. Weaker muscles can make everyday activities harder. They also increase the risk of falls, broken bones, and loss of independence.
Scientists have long believed that protein might help slow this decline. Protein provides the building blocks needed to repair and grow muscle tissue. Some earlier studies also indicated that protein could increase certain hormones involved in muscle growth.
Even so, there has been little evidence that protein alone makes healthy older adults stronger. To investigate this question, researchers recruited 141 adults aged 65 and older from the Boston area. Everyone taking part was generally healthy and already eating enough protein to meet the recommended daily intake.
The participants were divided into different groups. One group received capsules containing whey protein. Whey comes from milk and contains high levels of leucine, an amino acid known for supporting muscle-building processes in the body.
Another group received placebo capsules that contained no active protein. Some participants also received potassium bicarbonate. This substance is commonly found in antacid products. Researchers wanted to see whether reducing acid levels in the body could help protect muscle strength during aging. The trial lasted for 24 weeks, or about six months. At the end of the study, researchers measured muscle strength using several physical tests. These included leg press exercises, balance tests, and other standard assessments of physical performance. The results surprised the research team.
People who took whey protein were not stronger than those who took the placebo. Taking potassium bicarbonate also made no meaningful difference. Even combining the two supplements failed to improve strength.
The findings were similar for both men and women. Blood tests indicated that the protein supplement did affect the body. Participants had higher levels of IGF-1, a hormone linked to muscle growth. They also showed signs that their muscles were receiving signals to build more tissue.
Despite these biological changes, the improvements did not translate into greater strength. Researchers are still trying to understand why. One possible explanation is that muscles need physical activity before they respond fully to extra protein. Without resistance exercises, the body may simply have little reason to build stronger muscles.
Another possibility is that tiny changes happened inside the muscles but were too minor to appear during the strength tests used in the study. The researchers emphasized that these findings apply mainly to healthy older adults who already eat enough protein every day.
Protein supplements may still be useful in certain situations. For example, people recovering from surgery, serious injuries, or illnesses may not eat enough food. They often need extra nutrition to support healing. Protein drinks are also commonly recommended for people with poor appetites after operations such as hip fracture surgery.
Likewise, people who begin a new strength-training program may benefit from combining exercise with extra protein. Scientists believe this area deserves more research. For now, the evidence suggests that healthy older adults should not expect protein supplements alone to increase muscle strength.
Instead, regular resistance exercise remains the best-supported strategy. Activities such as lifting weights, using resistance bands, or doing bodyweight exercises challenge muscles and encourage them to stay strong. Researchers plan to continue studying whether combining exercise with protein supplements provides greater benefits than exercise by itself.
Until more evidence becomes available, experts recommend focusing on an active lifestyle instead of relying on protein powders or protein-enriched foods. For most healthy older adults, staying physically active appears to offer much greater benefits for maintaining strength, balance, and independence than simply consuming extra protein.
