I don't know about Dr. Gundry, but I do know that a healthy gut is important concerning the issues you are mentioning. Have you tried probiotics. I take them everyday as they provide good bacteria for gut health. It is true that the supplement should also contain prebiotics. The one I use has 10 strains and 60 million CFU's. Not only am I regular, but I feel really good. I will be 70 next year and I started taking probiotics after being on anti biotics for a while. Antibiotics kill all the bacteria in your gut (good and bad). I did my research and now my gut health is wonderful. It won't hurt for you to start taking probiotics. Check with your doctor. Make sure it has multiple strains and at least 40 to 60 million CFU's (colony forming units). God bless.