Foods that are rich in vitamin d
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Foods Rich in Vitamin D: A Comprehensive Overview
Fish as a Primary Source of Vitamin D
Fish, particularly fatty fish, are among the richest natural sources of vitamin D. Studies have shown that fish contributes significantly to dietary vitamin D intake. For instance, in the Japanese diet, fish accounts for approximately 90.7% of the total vitamin D intake, with other sources like mushrooms, eggs, and meat contributing much less . The vitamin D content in fish can range from 5 to 25 µg per 100 grams, making it a highly effective source for meeting daily vitamin D requirements .
Mushrooms and Their Vitamin D Content
Mushrooms are another notable source of vitamin D, particularly when exposed to ultraviolet (UV) light. The vitamin D content in mushrooms can vary significantly, with some varieties containing between 21.1 to 58.7 µg per 100 grams . This makes mushrooms a valuable plant-based source of vitamin D, especially for vegetarians and vegans.
Fortified Foods: Enhancing Vitamin D Intake
Given the limited number of natural food sources rich in vitamin D, fortification of foods has become a common practice to help populations meet their vitamin D needs. Fortified foods can include milk, yogurt, fat spreads, orange juice, breakfast cereals, and plant-based beverages 24. Fortification has been shown to significantly increase serum 25-hydroxyvitamin D concentrations, thereby reducing the prevalence of vitamin D deficiency .
Eggs and Dairy Products
Eggs, particularly the yolks, are a moderate source of vitamin D, with concentrations ranging from 1.3 to 2.9 µg per 100 grams 26. Dairy products, especially those that are fortified, also contribute to vitamin D intake. For example, fortified yogurt and cheese have been shown to improve vitamin D status and bone health markers in various populations, including postmenopausal women and the elderly 34.
Meat and Offal
While muscle meat generally contains lower levels of vitamin D, offal such as liver can be a more concentrated source. The vitamin D content in offal is higher compared to regular meat, making it a valuable addition to the diet for those looking to increase their vitamin D intake .
The Role of Supplements
Despite the availability of vitamin D-rich foods and fortified products, achieving the recommended daily intake of vitamin D through diet alone can be challenging. Therefore, dietary supplements are often recommended, especially for vulnerable groups such as the elderly, infants, and individuals with limited sun exposure 25.
Conclusion
In summary, fish, mushrooms, fortified foods, eggs, and offal are among the best dietary sources of vitamin D. Fortification of commonly consumed foods and the use of dietary supplements are effective strategies to ensure adequate vitamin D intake, particularly in populations at risk of deficiency. By incorporating these foods into the diet and considering fortified options, individuals can better meet their vitamin D needs and support overall health.
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Most relevant research papers on this topic
Fish as a major source of vitamin D in the Japanese diet.
Frequent fish intake is a recommended health practice for preventing vitamin D insufficiency in the elderly, as it contributes to 90% of total vitamin D intake in the Japanese diet.
Sources of vitamin D for humans.
Vitamin D can be synthesised in the skin, ingested through dietary sources, and fortified foods, but achieving adequate intake through diet alone is challenging.
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