Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Animal protein is scientifically validated as beneficial for the skeletal system, particularly for bone health. Bones are dynamic structures composed largely of a protein matrix (mainly collagen) into which minerals like calcium and phosphorus are deposited. Sufficient intake of dietary protein, including animal protein, is necessary for maintaining bone mass and strength, especially as people age. Multiple studies have shown that protein intake positively affects bone mineral density (BMD) and reduces fracture risk, especially when calcium intake is adequate (Bonjour et al., 2009; Kerstetter et al., 2011). Animal proteins (from meat, dairy, eggs, etc.) are considered "complete" proteins, providing all essential amino acids crucial for collagen synthesis and bone matrix maintenance. Furthermore, recent meta-analyses suggest that higher protein intake, including from animal sources, is associated with a reduced risk of hip fractures in older adults (Shams-White et al., 2017). There has been some debate over whether high protein diets may increase calcium excretion and harm bones; however, current evidence suggests that, in the context of adequate calcium and overall nutrition, animal protein supports rather than harms bone health. Thus, the use of animal protein to support the skeletal system is grounded in scientific evidence.

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