Vitamin a dietary sources
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Vitamin A Dietary Sources: Animal and Plant Foods
Vitamin A is found in two main forms in the diet: preformed vitamin A (retinol) from animal sources, and provitamin A carotenoids from plant sources. Animal-based foods such as liver, egg yolk, whole milk, butter, fish, and meats are rich in retinol, the active form of vitamin A. Plant-based foods, especially those with yellow-orange and dark green colors like carrots, spinach, pumpkin, sweet potato, kale, cabbage, squash, broccoli, tomatoes, and watermelon, provide provitamin A carotenoids, mainly beta-carotene, which the body can convert into active vitamin A Ribeiro2021Du2018Ahmed2023+3 MORE.
Major Food Contributors by Population and Region
Studies from different countries show that the main sources of vitamin A can vary. In China, most adults get their vitamin A from plant foods, with dark and light-colored vegetables and fruits being the largest contributors of carotenes, while eggs, meats, poultry, fish, and milk are the main sources of retinol . In Bangladesh, pregnant women get about 60% of their vitamin A from plant sources (mainly vegetables and tubers like colocasia, potato, beans, brinjal, and ripe tomatoes) and 40% from animal sources (mainly small fish, carp, eggs, and cow’s milk) . In Spain, animal foods provide most of the retinol, while carrots, tomatoes, spinach, and oranges are the main plant sources of provitamin A carotenoids .
Beta-Carotene and Provitamin A Carotenoids
Beta-carotene is the most important provitamin A carotenoid in the human diet. Its bioavailability and conversion to vitamin A can vary depending on the food matrix, preparation methods, and individual factors such as nutritional status and genetics. Despite this variability, beta-carotene from vegetables and fruits is a significant and safe source of vitamin A, especially in populations at risk of deficiency Grune2010Carazo2021.
Recommended Dietary Allowances and Health Implications
Humans rely on their diet to meet vitamin A needs. The recommended daily allowance (RDA) for adults is 900 µg for men and 700 µg for women, with higher needs during pregnancy and breastfeeding. Infants and children require lower amounts based on their body weight . Adequate intake of vitamin A is essential for vision, immune function, reproduction, and cellular health. Low consumption is linked to increased risk of deficiency-related diseases and chronic conditions Ribeiro2021Tang2024.
Conclusion
Vitamin A is available from a wide range of animal and plant foods. Animal products provide preformed vitamin A (retinol), while colorful fruits and vegetables supply provitamin A carotenoids like beta-carotene. Both sources are important for meeting daily vitamin A requirements and supporting overall health. Dietary patterns and food choices influence the main sources of vitamin A in different populations, but a balanced diet including both animal and plant foods is the most effective way to ensure adequate intake Ribeiro2021Du2018Ahmed2023+5 MORE.
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