Wider thighs and stronger leg muscles are linked to a lower risk of death from any cause, according to scientific research. However, health experts warn that thigh size alone does not explain the benefit, pointing to muscle mass and leg strength as the critical factors.
A 2020 study involving approximately 25,000 people found that every additional five centimetres in thigh circumference was associated with an 18 per cent lower risk of mortality from any cause. Researchers noted, however, that simply increasing thigh size does not guarantee a longer life span.
The relationship between leg dimensions and mortality relates to the physical composition of the thigh, which comprises muscle, fat and bone. Clare Steves, Professor of Ageing and Health at King's College London, stated that extensive evidence links solid musculature to improved health outcomes and extended longevity.
Professor Steves explained that muscle tissue assists in regulating blood glucose levels, potentially reducing the risk of developing type 2 diabetes, cardiovascular diseases and other chronic conditions. An earlier study published in 2009 had similarly linked smaller thigh circumference to an elevated risk of cardiovascular disease and death.
Leg strength and brain health
Leg strength becomes increasingly vital as individuals age. The muscles on the front of the thighs enable everyday movements such as rising from a chair and walking, making their preservation essential for maintaining independence during old age.
Research has also identified potential connections between leg strength and brain ageing. A study monitoring more than 300 female twins revealed that participants with greater leg strength demonstrated superior cognitive function and healthier brain structure when evaluated ten years later.
Investigators suggested that muscle activity may trigger biological processes that diminish inflammation and safeguard neural networks. Exercise also yields immune benefits, as demonstrated by a study of highly active older cyclists whose immune defences maintained characteristics typical of younger individuals.
Muscle function over thigh circumference
Medical specialists emphasize that having larger thighs does not automatically indicate stronger legs. A study focused on 70-year-olds determined that muscle weakness posed a more significant risk of mortality than the loss of muscle mass.
To build and maintain leg health, trainer Elizabeth Davies recommended performing resistance exercises, such as weight training, two to three times per week while progressively increasing intensity. Davies noted that this form of exercise also strengthens bones and aids in preventing osteoporosis.
The type of fat stored in the thighs may also offer protective qualities. Unlike visceral fat surrounding internal organs, which is tied to higher risks of type 2 diabetes and cardiovascular disease, lower body fat can store fatty acids and prevent them from building up in other regions of the body.
Experts conclude that no specific thigh measurement guarantees longevity. Instead, ongoing research indicates that maintaining strong, active legs remains the key factor for health as people age.
