How to Eat 30 Different Plants Per Week (And Why It Matters for Gut Health)
By Neer, NutriThrive Truganina · Last updated: 13 Jul 2026
The 30-plants-per-week target is one of the most actionable and evidence-backed recommendations to come out of gut microbiome research — and one of the least intimidating once you understand what counts.
Here’s the science, the logic, and a practical approach that makes 30 plants per week achievable without a meal plan or a lifestyle overhaul.
Where the number comes from
The American Gut Project, one of the largest microbiome studies conducted (involving samples from over 10,000 people across multiple countries), found a striking pattern: people who ate 30 or more different plant foods per week had significantly more diverse gut microbiomes than people who ate fewer than 10 different plants — regardless of whether they were vegetarian, vegan, or meat-eaters.
That last point is important. The diversity benefit from plant variety was independent of whether someone ate meat. It was about the number of different plants, not about avoiding animal products.
Gut microbiome diversity is consistently associated with better health outcomes across a range of research: stronger immune function, better metabolic markers, lower inflammation, improved mood, and reduced risk of conditions from obesity to depression. The causal arrows are complex, but the association is consistent and the mechanism is understood: different plant foods contain different types of fibre, polyphenols, and phytonutrients that feed different bacterial populations.
A diverse plant diet produces a diverse microbiome. A limited, repetitive plant diet — even if nutritionally adequate — produces a less diverse microbiome.
What actually counts
Every whole plant food counts — including ones you’d never think of as a "plant diversity" contribution:
Fruits, vegetables, legumes, whole grains, nuts, seeds, herbs, and spices. Yes, spices. A teaspoon of cumin in a dish is a different plant polyphenol from the turmeric in the same dish, and both feed different bacteria. This is not a trivial point — cooking with several different spices adds meaningfully to your plant diversity count.
Different coloured varieties of the same plant count separately: red capsicum and green capsicum have different phytochemical profiles and are treated differently by gut bacteria. Same for different types of apples, different varieties of beans, red versus white onions.
What a typical Australian week might currently look like
Most Australians eating a fairly repetitive diet might have: apple, banana, orange (3), carrot, broccoli, peas, tomato, lettuce, capsicum (9), rice, pasta, bread (3), chicken, eggs (not plants), yoghurt (not a plant), peanut butter (1 nut). That’s roughly 16 plant varieties — much better than you might have assumed, but still short of 30.
Getting from 16 to 30 doesn’t require new meals. It requires variety within existing habits.
How to get there without overhauling everything
The mixed bag approach at every meal. Instead of one vegetable side, use two or three different ones. Instead of a single grain, combine two (rice and quinoa cooked together, or oats with a sprinkle of chia). Instead of one type of nut, use a mixed nut handful.
A 5-seed habit. Keep a jar of mixed seeds (sunflower, pepitas, flax, sesame, chia) and add a sprinkle to whatever you’re having. That’s five plants in 10 seconds.
Different herbs and spices in cooking. If you currently cook with just salt and pepper, adding garlic, cumin, paprika, turmeric, and fresh herbs to a week’s cooking adds six plant diversity points essentially for free.
Frozen vegetable variety packs. A bag of frozen mixed vegetables usually contains 5-7 different plants. Stir into any meal.
Legume rotation. Instead of always using the same tin of chickpeas, rotate between chickpeas, lentils, black beans, kidney beans, and cannellini beans. Each counts separately.
A sample week hitting 30
Breakfast all week: oats (1) with banana (2), blueberries (3), chia seeds (4), walnuts (5).
Lunches: varying salad bases — one day with spinach (6), capsicum (7), cucumber (8), tomato (9), chickpeas (10), pumpkin seeds (11); another day with brown rice (12), edamame (13), shredded purple cabbage (14), carrot (15), sesame (16).
Dinners: stir-fry with broccoli (17), snap peas (18), mushroom (19), bok choy (20), garlic (21), ginger (22), served with rice (already counted) + side of kimchi (23); lentil soup (24) with onion (25), cumin (26), coriander (27), sweet potato (28); grilled fish with asparagus (29) and a mixed salad with sunflower seeds (30).
You’ve hit 30 before the week is out. And this is a sample diet that most Australians would recognise as realistic.
FAQ
Why 30 plants per week?
The American Gut Project found significantly higher microbiome diversity at 30+ plants versus fewer than 10.
What counts as a plant?
Fruit, vegetables, legumes, whole grains, nuts, seeds, herbs, and spices — all count.
Is 30 achievable?
More easily than people expect — most Australians eating a varied diet are already at 15-20 without realising it.
Written by Neer — NutriThrive Australia.
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These statements have not been evaluated by the TGA. This content is general information only, not medical advice.
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Update log
- 13 Jul 2026: Article published.