Studies suggesting that high protein intake is harmful should be viewed with perspective, as they are often based on limited methodologies (small sample sizes, use of ultra-processed sugary foods) rather than evidence of intrinsic protein toxicity.

noli's read

Brad Stanfield's analysis correctly highlights that study quality is paramount when interpreting nutritional risks. Large-scale observational studies, such as the meta-analysis published in the BMJ in 2020, have shown that total protein intake is actually associated with a reduction in all-cause mortality risk. Conversely, more recent research suggests that very high protein intakes could, via cellular mechanisms (such as those related to the amino acid leucine), influence certain cardiovascular health markers. However, the current consensus in the wellness field is that protein is essential for preserving muscle mass, particularly with age. The problem often lies in the source: protein-fortified ultra-processed products, which contain added sugars or additives, mask the benefits of natural and healthy protein sources. It is therefore crucial to distinguish raw protein from the processed food in which it is contained.

the sources

1. 1Morton RW, Murphy KT, McKellar SR, et al. 2018
2. 2Leidy HJ, Clifton PM, Astrup A, et al. 2015