Enough people read all the ingredients on every food package that if there was a common theme like this, it would be common knowledge. I don't know of a singula

Enough people read all the ingredients on every food package that if there was a common theme like this, it would be common knowledge. I don't know of a singular ingredient in common among the category of foods which would be targeted for this enhancement. Charitably, perhaps you are thinking of the "ingredient" of complex food engineering, which is any concerted effort by food engineers/scientists to modify "cafeteria food" to be more addictive and harder to stop eating. This focuses more on ingredients, which is relatively common knowledge. But it does go into some history with interesting backstories from board rooms to flesh it out: "NYT: The Extraordinary Science of Addictive Junk Food" - https://archive.is/DJ0fC https://archive.is/DJ0fC This one I find super fascinating. It focuses less on ingredients and more on the physical forces/sensations of the foods: sound, crunchiness, meltiness, airiness, and how those drive compulsion to grab another handful: "Food cravings engineered by industry" https://www.cbc.ca/news/health/food-cravings-engineered-by-industry-1.1395225 https://www.cbc.ca/news/health/food-cravings-engineered-by-i...