Vitamin D levels often decrease during winter due to reduced sunlight exposure. Maximizing sun exposure between 10 am and 3 pm is crucial for vitamin D synthesis, but this can be challenging in higher latitudes. Individuals with darker skin may require longer sun exposure. Vitamin D levels often decrease during winter due to reduced sunlight exposure. Maximizing sun exposure between 10 am and 3 pm is crucial for vitamin D synthesis, but this can be challenging in higher latitudes. Individuals with darker skin may require longer sun exposure. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle