Deficiency
Vitamin D deficiency
Widespread deficiency linked to reduced sun exposure and low dietary intake; weakens bones and affects immune function.
Symptoms
- bone pain
- muscle weakness
- fatigue
- increased fracture risk
These overlap with plenty of other conditions. Only a blood test can confirm a deficiency — treat this as a prompt to ask your doctor, not an answer.
Affordable foods that help
What happens
Without enough Vitamin D, the body absorbs less calcium from food, regardless of calcium intake — over time this weakens bones (osteomalacia in adults, and a contributor to osteoporosis) and has been linked to broader immune effects.
Who’s at risk
Elderly adults are at elevated risk: skin becomes less efficient at synthesizing vitamin D from sunlight with age, and older adults tend to spend less time outdoors.
Dietary approach
Because few whole foods naturally contain much vitamin D, fortified foods and sensible sun exposure both matter alongside diet; a healthcare provider can test blood levels and recommend supplementation if needed.
Citations
[1] NIH Office of Dietary Supplements — Vitamin D fact sheet.