Dr. Mary Vernon, MD, is a former president of the ASBP (American Society of Bariatric Physicians), the society of family physicians and doctors who specialize in treating obesity. She is one of the world's leading experts on treating obesity and diabetes using low carb diets. Here is a YouTube video that features her interview about Low Carb Explained.
Dr. Stephen Phinney, MD, Ph.D. has researched adaptation to very low carb diets (and exercise) for many decades. Here is his interview Low Carb Living
Dr. Peter Attia, a surgeon, discusses the history behind scientific research, clinical studies, and politics behind our beliefs and myths related to dietary guidelines (history of food pyramids), effects of fats, saturated fats, and cholesterol on metabolism and biochemistry of the human body Readdressing Dietary Guidelines
Abel James has numerous videos about keto-adaptation, effects, and problems with ketogenic diet, as well as numerous interviews with keto experts on his YouTube channel Fat Burning Man.