Hello, I’m a writer developing a health and wellness article exploring the Differences, Benefits, and Best Uses of Prebiotics and Probiotics. I’m seeking expert insights from gastroenterologists, registered dietitians, nutritionists, or health experts. Specifically, I’d love to include expert commentary on: What’s the fundamental difference between prebiotics and probiotics, and how do they work together to support gut health? Which ingredients or strains are most beneficial (e.g., inulin, FOS, Lactobacillus, Bifidobacterium)? How can someone tell if they need a prebiotic, a probiotic, or a combination supplement (synbiotic)? Are there any side effects or contraindications to be aware of when taking these supplements?

Probiotics are the "good" bacteria in the gut that impact just about every aspect of our health including digestion of food, absorption of nutrients, producing hormones and neurotransmitters, and producing short-chain fatty acids (SCFA's) that have powerful anti-inflammatory properties. Probiotics are found in fermented foods like Greek yogurt, kefir, kombucha, kimchi, and fermented vegetables. Prebiotics are the "fuel" that these good bacteria feed off to grow, survive, and multiply in number and diversity, and are found in fiber-rich foods like fruits, vegetables, nuts, seeds, and beans. The main difference is that probiotics are living bacteria, and prebiotics are the "food sources" that these bacteria need to survive and thrive. Diversity is key when it comes to strains of bacteria, since each different type of bacteria serves a different function. This is referred to as strain-level diversity, and essentially means that each of the trillions of bacteria in your gut serves a specific job or function, which allows the body as a whole to thrive and function optimally. For example, some strains of gut bacteria are responsible for reducing gas and bloating (like S. boulardii), while other strains of bacteria are responsible for improving your mood by producing serotonin (including Enterococcus and Lactobacillus). Another important type of bacteria that's been associated with longevity is called Akkermansia. A review published in Aging & Disease found that this strain of bacteria was found to improve gut integrity, restore cognitive function, slow muscle loss, reduce inflammatory markers, and extend the lifespan in aged mice. Signs of poor gut health, or gut dysbiosis, include gas, bloating, diarrhea and/or constipation, skin issues (like acne, eczema, and psoriasis), fatigue, and mental health issues like depression and anxiety. While food sources are the preferred source of probiotics and prebiotics, supplements are generally safe but can cause temporary bloating or gas, and should be used with caution in those who are immunocompromised or sensitive to fermentable fibers (such as those on low-fodmap diets). In addition, supplements aren't regulated by the FDA, so it's best to choose a supplement that's third-party tested and NSF certified to ensure quality. Thank you!!