A new study has found that regular exercise can naturally raise vitamin D levels, providing a fresh angle in the ongoing conversation about maintaining adequate nutrition and bone health. The results, which appear poised to shift health recommendations, could have a significant impact for Thai readers in a country where sunlight abounds yet vitamin D deficiency is still surprisingly common.
Vitamin D is crucial for bone strength, immune function, and overall wellbeing. Traditionally, the main sources have been exposure to sunlight and dietary intake from foods such as fish, eggs, and fortified products. However, despite Thailand’s abundant sunshine, a national health survey conducted by the Ministry of Public Health has indicated that as many as 77% of Thai office workers are still vitamin D deficient, likely due to indoor lifestyles and sun avoidance—a response to both skin cancer fears and cultural preferences for lighter skin.
Recent research published and reported in BBC News now reveals that engaging in physical activity could help counter this trend. The study, conducted by an international team of researchers, tracked participants’ vitamin D levels alongside their exercise habits. Over time, those who remained physically active—whether through running, cycling, or regular brisk walking—saw measurable increases in their vitamin D levels. These gains were observed even among individuals who did not spend significantly more time outdoors, suggesting that exercise itself may prompt the body to convert stored vitamin D into its active form or boost its metabolism in other ways.
The study’s authors, led by a team at a prominent global university, suggest that the increased blood circulation and metabolic rate linked to exercise may enhance vitamin D synthesis or release. As one co-author noted, “Our findings highlight a previously underappreciated link between physical activity and vitamin D metabolism that could have widespread implications for public health.” In interviews cited by BBC News, other experts stressed that while sunlight remains an important source, “regular movement could be an additional, safe way to shore up vitamin D,” and that this holds promise for populations worldwide, including in tropical countries.
For Thailand, these findings are particularly relevant. Urban lifestyles in cities such as Bangkok often limit outdoor activity to commutes, while rapid urbanization and concerns about air quality have further reduced time spent in the sun. Meanwhile, Thai cultural norms that prioritize light skin—reflected by a booming market in skin-whitening products—mean many citizens avoid sunlight and cover up even during brief outings. This combination has led to rates of vitamin D deficiency that rival those in colder, cloudier northern nations (The Nation Thailand).
The new research offers practical guidance to address this. By integrating regular physical activity—such as daily walks, cycling, or traditional sports like sepak takraw—into their routines, Thais may help safeguard their vitamin D levels without needing to overhaul their diets or sun-exposure habits. Provincial health officials quoted in a previous Bangkok Post report have emphasised the importance of accessible, safe spaces for exercise in both rural and urban areas, highlighting government efforts to promote active lifestyles through public parks and school programs.
Of course, the benefits of exercise extend beyond vitamin D. Thai medical authorities and public health experts consistently promote physical activity to reduce growing rates of diabetes, hypertension, and cardiovascular diseases—all of which are on the rise nationwide (World Health Organization: Thailand).
Looking ahead, experts recommend a holistic approach: continue enjoying Thailand’s varied cuisine, get sensible sun exposure, and, crucially, move more each day. For office employees or students who spend long hours indoors, simply incorporating midday walks, joining after-school sports, or cycling to markets can provide both immediate and long-term health dividends.
As this new research suggests, Thais have more ways than ever to keep their bodies strong and resilient. Embracing exercise isn’t just about fitness—it could be the easiest path to supporting healthy vitamin D levels, too.