As winter fastens its cold embrace on the world, many people complain of stiff knees and aching backs, which often appear to worsen with the season. In a medical explanation, sunlight deficiency has been considered a basic cause of this issue, as a lack of vitamin D, necessary for both bone and muscle health, is particularly seen during this time. When there is insufficient exposure to sunlight, joints get weaker, inflammation increases, and tissues become inflexible in these cold conditions and at low levels of activity. This deficiency in vitamin D diminishes calcium absorption, enhancing pain in the knees and the spine, making an agonising task out of routine movements.
The cold also increases viscosity in joints, reduces blood circulation, and heightens barometric pressure sensitivity. Reduced time spent outside leads to a natural decrease in vitamin D production when the skin encounters UVB rays, especially for city dwellers who get fewer hours of sun. In conversation with The Daily Jagran, Dr Sameer Patil, MS, Orthopaedics, Orthopaedic Surgeon at Vencer Hospital, Pune explains how sunlight is the main culprit behind winter joint pains.
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Why Sunlight Matters For Bone Health?
Vitamin D has a central role in facilitating the absorption of calcium by the body to maintain strong, well-mineralised bones. Dr Sameer Patil states, “In the absence of sufficient availability of vitamin D, the body starts tapping into the calcium stored in bones. This makes them weaker and more brittle.”
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Winter Joint Pain (Image Credits: Canva)
How To Make Up For Reduced Sunlight In Winter?
A practical avenue of maintaining vitamin D levels during colder months is planned sun exposure. Spending 30–35 minutes in direct sunlight before 8:30 AM at least four to five days a week will help significantly in natural vitamin D production. Dr Sameer Patil states, “As far as comfortably possible, the face, arms, and legs should be exposed, and sunlight should be taken outdoors rather than through glass windows since glass blocks UVB rays. Terraces, rooftops, balconies, and open compounds provide ideal locations for this daily routine.”
Diet also plays an important role in bone health. Food items like fortified milk and curd, paneer, eggs, fish, nuts, seeds, and mushrooms supply calcium, protein, and healthy fats that work synergistically with vitamin D. For those with confirmed deficiency, osteoporosis, or very limited mobility, supplementation may be necessary. But this should always be done only under medical guidance to avoid inappropriate dosing.
Dr Sameer Patil mentions, “Another important pillar for winter bone care is regular movement. Lightweight-bearing activities, like walking, gentle stair climbing, yoga, or chair workouts, improve bone density and balance.” The main thing is to be consistent, as even low-intensity activity significantly reduces the risk of falls.
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Winter has a way of encouraging people to stay inside, and sunlight avoidance can silently weaken bones. Simple habits of spending time in early morning sunlight, choosing bone-supportive foods, using supplements judiciously, and staying physically active can collectively protect bone health during the cold months. Incorporate these practices into daily winter routines and protect against the hidden risks that come with sunlight deficiency for stronger, healthier bones throughout the season.