You probably grew up with some version of the food pyramid—grains at the base, fats at the top, a vague sense of guilt about most of what you actually enjoyed eating. (And you may have seen a newer, inverted version released earlier this year.)
But here's what that these guidelines completely miss: your microbiome.
The trillions of microbes living in your gut care about what you're feeding them. And not all fiber, fats, or fermented things are equal when it comes to keeping your inner ecosystem thriving.
So we decided it was high time to make our own version, organized entirely around what the science says your gut actually needs. Meet the Gut-First Food Pyramid.
Here, our food groups range from the Microbiota-Accessible Carbohydrates that feed your gut microbes to the "outliers" that are likely doing your microbiome more harm than good. (And yes, you spied correctly: Coffee and chocolate are in the "good for your gut" column.)
Let's take a closer look.
Tier 1: Microbiota-Accessible Carbohydrates (MACs)
The primary fuel for your gut ecosystem.
MACs are the non-digestible carbohydrates in plant foods that pass through your small intestine intact, and get fermented by your gut bacteria in the large intestine. They're the substrate that keeps your microbial community alive, diverse, and producing the short-chain fatty acids that regulate inflammation, gut barrier function, and even mood.1
Eat more: whole grains (brown rice, oats, quinoa), legumes (beans, chickpeas, lentils), cruciferous and root vegetables, leafy greens, fruit (apples, pears, berries), nuts and seeds (chia, flax, walnuts, almonds)
Pro tip: Different fibers feed different microbial species. Eating 30+ diverse plant foods per week has been associated with significantly greater microbiome diversity—and diversity is the single best marker of a resilient, healthy gut.
Tier 2: Prebiotics
Selective fertilizer for beneficial microbes.
Think of prebiotics as the precision layer on top of your MAC foundation. While MACs feed your microbial community broadly, prebiotics—like inulin and fructooligosaccharides—selectively stimulate the growth of specific beneficial bacteria like Bifidobacterium and Lactobacillus.2
Eat more: onions, garlic, leeks, asparagus, green banana, cabbage, Jerusalem artichoke
Pro tip: Start slow. If you're not currently eating many prebiotic-rich foods, add them gradually. Your gut bacteria will produce gas as they ferment these fibers—that's normal biology, not something going wrong. It typically settles within a few weeks as your microbiome adapts.
Tier 3: Fermented Foods
Temporary visitors that influence the ecosystem.
Here's something that might surprise you: the live microbes in fermented foods probably don't take up permanent residence in your gut. Most of them pass through. So why eat them?
Because their visit matters. As these transient microbes travel through your gut, they interact with your resident microbial community, support immune signaling, and produce beneficial metabolites. A 2021 Stanford study found that a high-fermented-food diet significantly increased microbiome diversity and decreased inflammatory markers after just 10 weeks.3
Eat more: yogurt with live cultures, kefir, sauerkraut, kimchi, miso, kombucha
Pro tip: Look for the live cultures label. Heat-treated fermented foods (like most shelf-stable sauerkraut) don't carry live bacteria. For gut benefit, look for refrigerated versions labeled "contains live active cultures" or "unpasteurized."
Tier 4: Healthy Fats & Polyphenols
Compounds that shape the gut environment.
These foods don't directly feed your microbes, but they powerfully shape the conditions they live in. Polyphenols are plant compounds metabolized by gut bacteria into anti-inflammatory byproducts. Healthy fats, particularly oleic acid in extra virgin olive oil, support the gut lining and modulate the inflammatory environment that determines which microbial species thrive.4
Yes, coffee and dark chocolate belong here. Polyphenols in both have been shown to selectively increase beneficial bacteria populations. (This is your scientific permission slip.)
Eat more: extra virgin olive oil, berries, dark chocolate (70%+), coffee, green tea, walnuts, almonds
Pro tip: Quality matters most here. Extra virgin olive oil is significantly higher in polyphenols than refined olive oil. The same goes for dark chocolate vs. milk chocolate. With this tier, the less processed, the better.
Tier 5: Outliers
Occasional inputs that stress the soil.
No shame, no taboos. These are microbiome disruptors: Research consistently shows they negatively impact microbial diversity, reduce beneficial species, and feed less desirable bacterial populations. They're best enjoyed as occasional vices, not daily staples.5
Limit: ultra-processed foods, added sugars, excess alcohol, artificial sweeteners
Pro tip: Occasional disruption doesn't undo years of good habits. Studies show the gut can largely recover from a few days of poor diet within a week of returning to a fiber-rich routine. Consistency over perfection, always.
The Bottom Line
The gut-first pyramid isn't a comprehensive eating system—rather, it's a framework for thinking about food through the lens of what it does to the living ecosystem inside you. The goal is to feed your microbiome consistently, across a diverse array of plant foods, fibers, and fermented inputs.
That's why we built LOAM: to support in filling the gaps. Even the most plant-forward eaters often lack the specific prebiotic fibers that most selectively nourish beneficial bacteria. Our 6-in-1 Prebiotic Fiber Formula was engineered to complement this pyramid—giving your microbes a diverse fiber input that's invisible in your routine and impactful where it counts.
References:
- Ayakdaş, G., & Ağagündüz, D. (2023). Microbiota-accessible carbohydrates (MACs) as novel gut microbiome modulators in noncommunicable diseases. Heliyon, 9(9), e19888. https://doi.org/10.1016/j.heliyon.2023.e19888
- Davani-Davari, D., Negahdaripour, M., Karimzadeh, I., Seifan, M., Mohkam, M., Masoumi, S. J., Berenjian, A., & Ghasemi, Y. (2019). Prebiotics: Definition, Types, Sources, Mechanisms, and Clinical Applications. Foods (Basel, Switzerland), 8(3), 92. https://doi.org/10.3390/foods8030092
- Wastyk, H. C., Fragiadakis, G. K., Perelman, D., Dahan, D., Merrill, B. D., Yu, F. B., Topf, M., Gonzalez, C. G., Van Treuren, W., Han, S., Robinson, J. L., Elias, J. E., Sonnenburg, E. D., Gardner, C. D., & Sonnenburg, J. L. (2021). Gut-microbiota-targeted diets modulate human immune status. Cell, 184(16), 4137–4153.e14. https://doi.org/10.1016/j.cell.2021.06.019
- Memmola, R., Petrillo, A., Di Lorenzo, S., Altuna, S. C., Habeeb, B. S., Soggiu, A., Bonizzi, L., Garrone, O., & Ghidini, M. (2022). Correlation between Olive Oil Intake and Gut Microbiota in Colorectal Cancer Prevention. Nutrients, 14(18), 3749. https://doi.org/10.3390/nu14183749
- Hetta, H. F., Sirag, N., Elfadil, H., Salama, A., Aljadrawi, S. F., Alfaifi, A. J., Alwabisi, A. N., AbuAlhasan, B. M., Alanazi, L. S., Aljohani, Y. A., Ramadan, Y. N., Abd Ellah, N. H., & Algammal, A. M. (2025). Artificial Sweeteners: A Double-Edged Sword for Gut Microbiome. Diseases (Basel, Switzerland), 13(4), 115. https://doi.org/10.3390/diseases13040115
