Synopsis

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

Soy protein has some scientific evidence supporting its role in skeletal system (bone) health, though the strength of evidence is modest. Soy protein is a source of isoflavones, which are phytoestrogens—plant-derived compounds with weak estrogen-like activity. Estrogen is known to help maintain bone density, particularly in postmenopausal women. Some clinical studies have shown that consumption of soy protein or isoflavone-rich soy products may help attenuate bone loss in postmenopausal women, potentially by stimulating osteoblastic (bone-building) activity and reducing bone resorption. Meta-analyses and systematic reviews, however, report mixed results: while a few trials indicate modest improvements in bone mineral density (BMD), many show no significant effect when compared to placebo or other protein sources.

It's also important to note that soy protein, as a high-quality plant protein, provides amino acids necessary for bone matrix synthesis. However, standard dietary protein intake (from various sources) is generally sufficient for this need in most people. The overall scientific consensus is that while soy protein may have some beneficial effect on bone health due to its isoflavone content, it should not be relied upon as a primary intervention for supporting skeletal health. Instead, it can be part of a balanced diet that includes other bone-supportive nutrients such as calcium and vitamin D.

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