I’ve Been Really Moody and Gaining Weight, but Not Eating More. Why? How Can I Reverse This?
15 Dec 2025 · 9 min
JJ Virgin and Dr. Steven Gundry explain why you might gain weight and feel moody without eating more: bad gut bacteria drive cravings for sugar and fat while failing to produce mood-supporting hormones, whereas good bacteria promote cravings for greens. Gundry says dietary changes can shift your microbiome within days.
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I've been really moody and gaining weight, but not eating more.
Why?
How can I reverse this? This is JJ Virgin, four time New York Times bestselling author, celebrity nutrition expert, and Fitness hall of Famer. I've been on a lifelong quest for answers to the toughest health questions, and now I'm sharing what I found with you.
Welcome to Ask the Health Expert.
Liz on Instagram asks, I've been really moody and gaining weight but not eating more.
Why?
How can I reverse this? Hey, it's JJ and today I have Dr. Steven Gundry with me to answer this question. Now, you may know him from his New York Times bestselling books, the Plant Paradox and the Longevity Paradox, and next up, the Energy Paradox. He's a cardiothoracic surgeon who retired to focus on helping patients not need him by using nutrition and lifestyle strategies. Plus, he loves dogs. A man after my own heart, and swears that owning a dog and walking a dog is one of the key aspects to longevity. We'll be right back with the answer, so stay with me.
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Well, it turns out some of the most exciting research from the Human Microbiome project and additional research has shown that the composition of your gut microbiome, number one, determines the foods that you're going to go looking for, number one. And I have divided those bugs into good bugs, which I call gut buddies, and bad bugs, which I call gang members. And not only do bad bugs make you seek out simple sugars and fats, particularly saturated fats, but these bad bugs actually extract more of those calories and pass them into you. These bad bugs are actually incapable of making feel good hormones that actually go to your brain and make you feel good. As opposed to the gut buddies, the good guys, they actually take the foods that they want and they actually make you go seek out resistant starches, leafy greens, because they want it. And they actually guide your brain to seek these foods out and they make you hungry for these foods. I have so many, particularly men who are meat and potato guys, who I tell them the next time I see them in a few weeks they're going to be craving greens. And they walk in shaking their head and they say, this is ridiculous. All I want is green salads and I never wanted a salad in my life. What's happening to me? And I say, your good bugs have taken over your brain and they're actually making you seek these foods out for them. They take more of these calories for themselves. They make more of these guys. And like I talk about in all my books, you should see a giant snake looking up at you from your bathroom toilet bowl. And that's all those guys eating the food you ate and not giving it to you. So lastly, the huge benefit of these good guys, the gut buddies, is that they make feel good hormones. So, long story short, if you're moody and gaining weight, you've got a set of gang members that you need to banish and the good news is, in my book, there's good evidence that three days is all you need to change from a bunch of gang members to a bunch of gut buddies just by changing the food you eat. And I give you an entire guide in the Energy Paradox on how to do that.
This is JJ with Ask the Health Expert.
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