Protein and muscle
3 papers in the library, strongest Moderate.
Graded Moderate · A small trial of 96 women over 12 weeks with random group assignment; 20 dropped out, and muscle mass was only estimated.
Papers 3
- Women 65 and Older Gain Muscle With Training Plus Amino AcidsModeraten = 962026Journal of the International Society of Sports NutritionOlder women who did strength training for three months and also drank protein building blocks gained estimated muscle mass. They also scored better on a fitness test designed for older adults. The researchers conclude that the combination worked better than either training or the drink alone. The study in South Korea enrolled 96 healthy women aged 65 or older, about 73 on average. They were split at random into four groups: no change, training, amino acids, or both. Training was a one-hour circuit three times a week, first with resistance bands, later with kettlebells. Essential amino acids are protein building blocks the body cannot make itself. Women took 5.5 grams in water twice a day. In both training groups, blood levels of myostatin, a protein that brakes muscle growth, went down. An inflammation marker called TNF-alpha fell only in the group that did both. Muscle mass was estimated with a weak electrical current. This method captures all fat-free tissue and is affected by hydration. Twenty of the 96 women dropped out, and diet was not fully controlled. Whether the combination slows age-related muscle loss in the long run cannot be told from 12 weeks in women who were already fit.
- Low-Protein Diets: A Methionine Boost May Ward Off FrailtyPreliminary2026Cell metabolismTraditional plant-rich diets may help people live longer. Yet they can sometimes weaken physical robustness. A short commentary in the journal Cell Metabolism highlights new work that offers an explanation. Its central message: for metabolism and aging, the kind of protein matters, not just the amount. A team led by Fanti added a moderate amount of methionine, one of the building blocks of protein, to a low-protein diet inspired by Mediterranean eating. According to the commentary, this reduced body fat and frailty without cutting calories. The work traces the effect to a chain of hormones: growth hormone, GLP-1 and FGF21. This is a brief expert commentary, not the original study. Its summary does not say who or what was studied, how many, or for how long. Whether the findings carry over to people's everyday diets cannot be judged from it.
- Older Muscles Need More Protein per Meal Than Young OnesPreliminary2026Frontiers in nutritionMuscle mass and strength fade with age. This age-related muscle loss raises the risk of falls, hospital stays and early death. A review gathers what is known about the part protein plays. Its main point is that standard protein advice may fall short for older people, because their muscles respond less strongly to protein. According to the data it cites, young adults need about 0.24 grams of protein per kilogram of body weight per meal. Older people need about 0.4 grams for a comparable response. The building blocks matter too, especially one called leucine. The body uses animal protein more easily, but well-combined plant proteins can also cover the need. For vitamin D, a cited analysis of seven trials in people aged 60 and over found no clear gain in muscle mass or strength. The review summarizes earlier studies and adds no new data of its own. The authors say further studies must work out the best amounts, sources and timing. They see strength training as a fixed part of any plan to keep muscles working.
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