Doctors are especially concerned about deficiency in older adults because low vitamin D levels may contribute to osteoporosis and increased fall risks. Children who lack sufficient vitamin D may develop weak bones and growth problems.
Several factors can increase deficiency risk, including spending little time outdoors, using strong sunscreen constantly, obesity, aging, darker skin tone, and digestive disorders that reduce nutrient absorption. People living in areas with limited sunlight may also face greater risk during colder months.
