Soda pop drinks, salad dressings, pickles, deli meats, bbq sauce, and a whole host of other foods often contain high fructose corn syrup -- a potentially harmful chemical now shown to alter genes in our brains: "The research team sequenced more than 20,000 genes in the rats' brains, and identified more than 700 genes in the hypothalamus (the brain's major metabolic control center) and more than 200 genes in the hippocampus (which helps regulate learning and memory) that were altered by the fructose. The altered genes they identified, the vast majority of which are comparable to genes in humans, are among those that interact to regulate metabolism, cell communication and inflammation. Among the conditions that can be caused by alterations to those genes are Parkinson's disease, depression, bipolar disorder, and other brain diseases."
https://www.sciencedaily.com/releases/2016/04/160422091900.htm