"I've been really moody and gaining weight, but not eating more. Why? How can I reverse this?" asks Liz on Instagram. Here with our answer is Dr. Stephen Gundry, former cardiac surgeon and author of the best-selling Plant Paradox book series. According to Dr. Gundry, the answer may likely lie in the gut. Tune in to the full answer where he breaks down how the gut works and how you can optimize your mood by fixing your gut. Use code JJVIRGIN25 for 25% off first-time orders at gundrymd.com (bundles excluded, cannot be combined with other offer codes). Learn more about your ad choices. Visit megaphone.fm/adchoices