Simon Hill's Plant Proof Protocol

Simon Hill is an Australian nutritionist, physiotherapist, and the host of *The Proof* — one of Australia's top-ranked health podcasts and a platform that has become a go-to resource for evidence-based nutritional science. With guests ranging from Peter Attia and Valter Longo to Tim Spector and Matthew Walker, Hill has built a reputation not as a promoter of a dietary ideology but as a rigorous translator of nutrition research who happens to eat a predominantly plant-based diet. His book *The Proof Is in the Plants* became a national bestseller in Australia and articulated a philosophy that has resonated widely: eat more plants, do not be dogmatic about it, and follow the evidence wherever it leads.

Overview

Hill's protocol occupies a distinctive position in the longevity nutrition landscape. He advocates for a whole-food, plant-predominant diet — not because of ethical or environmental ideology (though he acknowledges those dimensions) but because the cumulative weight of epidemiological and interventional evidence consistently associates higher plant food intake with reduced risk of cardiovascular disease, cancer, type 2 diabetes, neurodegenerative disease, and all-cause mortality. Crucially, he distinguishes his position from the more rigid plant-based advocates who frame any animal food consumption as harmful, acknowledging that the evidence supports a spectrum of healthy dietary patterns and that the quality and quantity of plant foods consumed matter more than the strict exclusion of animal products.

This anti-dogmatic stance has earned Hill credibility across dietary tribes that rarely speak to each other. Keto advocates, carnivore adherents, and vegans all listen to his podcast because he treats the evidence honestly, changes his position when new data warrants it, and refuses to demonize any whole food category without strong justification. His protocol reflects this intellectual flexibility: it is plant-predominant by default but accommodates individual variation, cultural context, and personal preference.

The 30-Plant Challenge

The foundational dietary recommendation in Hill's protocol is consuming at least thirty distinct plant species per week. This target, drawn from the American Gut Project research led by Rob Knight and widely popularized by Tim Spector, is based on evidence that microbial diversity in the gut — a robust marker of overall health — correlates more strongly with the diversity of plant foods consumed than with any other dietary variable.

Hill breaks the thirty-plant target into practical categories: vegetables, fruits, legumes, whole grains, nuts, seeds, herbs, and spices. Each distinct species counts as one toward the weekly total. He emphasizes that this is not about volume — a pinch of cumin and a handful of blueberries each count equally — but about exposing the gut microbiome to the widest possible array of fibers, polyphenols, and prebiotic compounds.

Berries receive particular emphasis in his protocol. Blueberries, strawberries, raspberries, and blackberries are recommended daily for their anthocyanin content, with research linking regular berry consumption to improved cardiovascular markers, enhanced cognitive function, and reduced inflammatory signaling. Cruciferous vegetables — broccoli, cauliflower, Brussels sprouts, kale — are highlighted for their sulforaphane content and documented associations with reduced cancer risk.

Fiber-First Approach

Hill positions fiber as the single most important macronutrient for long-term health, citing meta-analyses associating higher fiber intake with reduced all-cause mortality, cardiovascular events, colorectal cancer, and type 2 diabetes. He recommends a minimum of thirty grams of fiber daily, ideally closer to forty or fifty, from diverse whole food sources rather than isolated fiber supplements.

His practical guidance for increasing fiber intake is gradual and digestive-system-friendly: start by adding one additional serving of legumes per day, introduce new vegetables each week, swap refined grains for whole grains, and increase water intake alongside fiber to support digestive transit. He notes that many people who experience digestive discomfort on plant-based diets are simply increasing fiber too rapidly without allowing the microbiome time to adapt.

Fermented foods complement the fiber foundation, providing live beneficial bacteria that enhance microbial diversity. Hill recommends daily consumption of at least one fermented food — sauerkraut, kimchi, yogurt, kefir, tempeh, or miso — and notes that the Stanford fermented food study demonstrated that fermented foods were more effective at increasing microbial diversity than high-fiber diets alone in the short term.

Supplementation for Plant-Based Eaters

Hill is transparent about the nutritional gaps that a plant-predominant diet can create and addresses them directly rather than pretending they do not exist. This honesty is central to his credibility.

Omega-3 fatty acids are his primary supplement recommendation. He notes that while plant foods provide alpha-linolenic acid (ALA), the conversion rate to the physiologically active EPA and DHA forms is low and variable. He recommends algae-derived omega-3 supplements as the plant-based equivalent of fish oil, providing direct EPA and DHA without the environmental concerns or heavy metal contamination risks associated with fish-derived products. For those who eat fish, two to three servings of fatty fish per week can substitute for supplementation.

Vitamin D supplementation is recommended for most people regardless of diet, particularly those living at higher latitudes or spending limited time outdoors. He recommends blood testing and supplementation to maintain levels between 40 and 60 ng/mL.

Vitamin B12 supplementation is considered non-negotiable for anyone eating a fully plant-based diet and advisable for those consuming minimal animal products. Vitamin C from whole food sources — citrus, bell peppers, berries, broccoli — enhances iron absorption from plant-based meals, a practical consideration for those relying primarily on non-heme iron sources. Probiotics provide additional microbial support alongside dietary fermented foods.

Strength Training and Movement

Hill is emphatic that plant-based nutrition must be paired with adequate exercise, particularly resistance training. He pushes back against the stereotype that plant-based eaters are necessarily undermuscled, citing research on plant-based athletes and his own training practice. He recommends three to four strength training sessions per week, emphasizing progressive overload and compound movements.

He addresses protein adequacy directly: a well-planned plant-based diet can provide sufficient protein for muscle maintenance and growth through strategic combination of legumes, tofu, tempeh, seitan, whole grains, nuts, and seeds. He recommends a protein target of 1.6 to 2.2 grams per kilogram of body weight for those engaged in regular resistance training, acknowledging that this requires intentional planning on a plant-based diet.

What Makes It Unique

Simon Hill's Plant Proof Protocol is unique because it demonstrates that evidence-based plant-predominant eating and intellectual honesty are not mutually exclusive. In a nutritional landscape polarized between plant-based evangelism and anti-plant backlash, Hill occupies the productive middle ground — advocating for more plants while acknowledging nutritional gaps, recommending supplements where needed, and refusing to let dietary identity override scientific evidence. His podcast platform gives him access to the researchers producing the evidence he synthesizes, creating a protocol that is not just informed by the science but actively in conversation with it.