Evidence supporting the use of: Tall Kale
For the health condition: Osteoporosis

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Tall kale (Brassica oleracea var. acephala) is sometimes promoted for bone health due to its high content of calcium, vitamin K, and other micronutrients essential for bone metabolism. Scientific validation for the use of kale, including tall kale, in osteoporosis prevention or treatment is limited but plausible. Kale is a good plant-based source of calcium, which is a critical mineral for bone density. Furthermore, kale is rich in vitamin K1, which is involved in the carboxylation of osteocalcin, a protein necessary for bone mineralization. Some epidemiological studies suggest that higher intakes of dietary calcium and vitamin K are associated with reduced risk of osteoporosis and fractures, but these studies typically consider overall dietary patterns rather than the effects of kale specifically.

There is a lack of direct clinical trials evaluating kale or tall kale as a standalone intervention for osteoporosis. Most scientific evidence supports the general principle that diets high in leafy greens can contribute to bone health. However, the bioavailability of calcium from kale is relatively high compared to some other plant sources, which adds moderate support to its inclusion in a bone-friendly diet. In summary, while there is some scientific rationale for including tall kale as part of an osteoporosis-preventive diet, direct evidence is limited, justifying a moderate evidence rating.

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