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Dr. Berg talks about feeling irritable on keto (the ketogenic diet). When you keto adapt and change your metabolism from sugar to fat, you will need additional nutrients (B-vitamins, minerals like potassium).  This can come from low blood sugars. Because the brain doesn't contain stored glucose (glycogen), it depends on glucose from the blood and if there is low blood sugars, not enough fuel, this can severely affect how you feel in the head (thus the irritable and moody brain). This is is why it key to run your body on ketones instead. Keto and intermittent fasting must be done together and you need to use high quality foods. If your trying to do with without enough potassium foods (large amounts of vegetables), you may not feel correct. Its these nutrients that help fix insulin resistance and stabilize your blood sugars.
 
Dr. Eric Berg DC Bio:
Dr. Berg, 51 years of age is a chiropractor who specializes in weight loss through nutritional & natural methods. His private practice is located in Alexandria, Virginia. His clients include senior officials in the U.S. government & the Justice Department, ambassadors, medical doctors, high-level executives of prominent corporations, scientists, engineers, professors, and other clients from all walks of life. He is the author of The 7 Principles of Fat Burning.

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