In this episode of the podcast, Dr. Jacob Mey leads our discussion of the article entitled "Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake". This manuscript was led by Dr. Kevin Hall who is a obesity researcher at the National Institutes of Health and one of the world's experts in energy balance and body weight regulation. We also briefly discuss one of Dr. Hall's more recent pre-prints entitled "A Plant-Based, Low-Fat Diet Decreases Ad Libitum Energy Intake Compared to an Animal-Based, Ketogenic Diet: An Inpatient Randomized Controlled Trial".