- Indoor lifestyles
- Seasonal changes
- Living in areas with limited sunlight
- Consistent use of sun protection
- Air pollution
Dietary Factors
Although some foods contain vitamin D, it is naturally present in relatively few foods.
Sources include:
- Salmon
- Sardines
- Mackerel
- Egg yolks
- Fortified dairy products
- Fortified cereals
- Certain mushrooms
Even with a balanced diet, some individuals may still have difficulty meeting their daily needs.
Aging
As people age, the skin becomes less efficient at producing vitamin D from sunlight. This can increase the risk of deficiency and make bone health a greater concern.
How Vitamin D Supports Bone Health
Vitamin D works closely with calcium and phosphorus to help maintain strong bones.
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