Soy Protein Boosts Brain Function

A number of previous studies provide evidence that soy consumption helps to lower the risk of heart disease and certain forms of cancer, as well as reduce the severity of menopausal symptoms.  D. Yimit, from Xinjiang Medical University (China), and colleagues hydrolyzed soy protein isolate to produce 18 amino acids. They administer 8 g of the peptide powder as a beverage to 10 healthy subjects, ages 20 to 25 years. After these participants consumed the beverage, the researchers administered a test to determine brain cerebral blood flow. Additionally, blood samples were collected before and after, to analyze changes in neurotransmitters, as well as to monitor white blood cell levels. The researchers observed that in those subjects with higher levels of granulocytes (a type of white blood cell), the peptide powder lowered these levels while increasing lymphocytes. The opposite effect occurred in subjects with higher levels of lymphocytes. Ingestion of the peptide also resulted in a decrease of adrenaline and an increase in dopamine. Explaining that such effects may consequently impact the sympathetic and parasympathetic nervous systems, the study authors conclude that: "Soybean peptides can modulate cellular immune systems, regulate neurotransmitters, and boost brain function.”