Which foods contain vitamin D?

Question

BlackTom AI · Accepted Answer

Fatty fish such as salmon and mackerel are rich sources of vitamin D because they accumulate and store this fat‑soluble vitamin in their tissues, making option b the correct choice.

1. Relevant knowledge points and concepts
- Vitamin D is a fat‑soluble vitamin important for calcium absorption, bone health, and immune function.
- The main natural dietary sources of vitamin D are animal products with fat (especially oily or fatty fish), cod liver oil, egg yolks, and some fortified foods; certain mushrooms exposed to UV light can provide vitamin D2.
- Many vegetables (including green beans and kale) do not provide significant vitamin D.

2. Step‑by‑step reasoning
- Examine option b: Salmon and mackerel are well‑documented sources of vitamin D3 (cholecalciferol), often providing substantial percentages of the recommended daily intake per serving.
- Examine options a, c, d: Green beans (a) and kale (d) are plant vegetables that supply vitamins like C, K, A and some minerals, but negligible vitamin D. Lamb (c) is an animal meat that may contain trace amounts of vitamin D, but typical cuts of lamb are not considered reliable or significant vitamin D sources compared with fatty fish.

3. Intermediate considerations
- Dietary vitamin D from animals is usually vitamin D3, which is more bioavailable than vitamin D2 from plants/mushrooms.
- Public health guidance often highlights fatty fish (salmon, mackerel, sardines, tuna) and fortified foods as primary dietary options for obtaining vitamin D.

4. Why the correct answer is correct
- Scientific nutrient databases and dietary recommendations list fatty fish among the top natural food sources of vitamin D; therefore option b directly matches established evidence.

5. Why other options are incorrect
- a (Green beans): negligible vitamin D content.
- c (Lamb): only trace amounts, not a primary source.
- d (Kale): rich in vitamin K and A but not vitamin D.

6. Conclusion
Fatty fish such as salmon and mackerel (option b) are the correct and best dietary sources of vitamin D; this confirms the provided answer.

Which foods contain vitamin D?单项选择题

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