Why Vitamin C is such a boon for muscles

Older people who eat plenty of vitamin C - commonly found in citrus fruits, berries, and vegetables - have the best skeletal muscle mass, according to new research. Published in the 'Journal of Nutrition', the study was led by the University of East Anglia (UEA). This is important because people tend to lose skeletal muscle mass as they get older - leading to sarcopenia (a condition characterised by loss of skeletal muscle mass and function), frailty, and reduced quality of life.

Lead researcher Prof. Ailsa Welch, from UEA's Norwich Medical School said: "As people age, they lose skeletal muscle mass and strength. People over 50 lose up to one per cent of their skeletal muscle mass each year, and this loss is thought to affect more than 50 million people worldwide. It's a big problem because it can lead to frailty and other poor outcomes such as sarcopenia, physical disability, type-2 diabetes, reduced quality of life, and death." The professor added: "We know that Vitamin C consumption is linked with skeletal muscle mass. It helps defend the cells and tissues that make up the body from potentially harmful free radical substances. Unopposed these free radicals can contribute to the destruction of muscle, thus speeding up age-related decline. But until now, few studies have investigated the importance of Vitamin C intake for older people. We wanted to find out whether people eating more Vitamin C had more muscle mass than other people."

The research team studied data from more than 13,000 people aged between 42-82 years, who are taking part in the EPIC (European Prospective Investigation into Cancer and Nutrition) Norfolk Study. They calculated their skeletal muscle mass and analysed their Vitamin C intakes from a seven-day food diary. They also examined the amount of Vitamin C in their blood. Dr Richard Hayhoe, also from UEA's Norwich Medical School, said: "We studied a large sample of older Norfolk residents and found that people with the highest amounts of Vitamin C in their diet or blood had the greatest estimated skeletal muscle mass, compared to those with the lowest amounts. "We are very excited by our findings as they suggest that dietary vitamin C is important for muscle health in older men and women and may be useful for preventing age-related muscle loss. This is particularly significant as Vitamin C is readily available in fruits and vegetables, or supplements, so improving intake of this vitamin is relatively straightforward." The researchers said that found that nearly 60 per cent of men and 50 per cent of women participants were not consuming as much Vitamin C as they should, according to the European Food Safety Agency recommendations. “We're not talking about people needing mega-doses. Eating citrus fruit, such as orange, each day, and having a vegetable side to a meal will be sufficient for most people," added Hayhoe.