Thirty different plants a week sounds like a project. It sounds like spreadsheets and spiralisers and a fridge full of things you bought with good intentions. In practice, most people who cook even moderately varied food are closer to the number than they think, and the gap is closed by seasoning, not sacrifice. But first, where does the figure actually come from?
The study behind the number
The 30-plants figure comes from the American Gut Project, a large citizen-science study that analysed stool samples from thousands of volunteers. People who reported eating more than 30 different plant types a week had noticeably more diverse gut microbiomes than people eating fewer than 10, and diversity is generally read as a marker of a resilient gut.
Worth saying plainly: this is an association, not proof of cause. People who eat 30 plants a week tend to differ in other ways too. But the finding fits a much larger body of evidence that fibre variety feeds a wider range of gut bacteria, and 30 has proven a genuinely useful target: concrete enough to aim at, loose enough not to become a religion.
What counts (nearly everything)
- Herbs and spices count. The parsley on top, the cumin in the pan, the cinnamon in the porridge: each one is a point.
- Seeds, nuts and wholegrains count. A mixed-seed jar can be four or five plants in a single spoonful.
- Coffee counts. It's a brewed plant, and its polyphenols appear to interest your gut bacteria as much as they interest you.
- Colours count, in spirit. Strictly, red and yellow peppers are the same species, so purists score them once. But different colours carry different polyphenols, so mixing them is still worth doing even when it doesn't move the score.
Why this may matter more in perimenopause
Your gut is home to a collection of bacteria researchers call the estrobolome: microbes that produce enzymes involved in recycling oestrogen, helping determine how much circulates rather than leaving the body. The theory is that a more diverse microbiome supports steadier oestrogen handling at exactly the life stage when levels are lurching about.
We want to hedge hard here: this is emerging science, mostly from small human studies and animal work, and nobody can yet promise that plant variety smooths hormonal symptoms. What we can say is that the same diverse, fibre-rich pattern is linked to better heart, metabolic and mood outcomes in midlife anyway, so the bet costs nothing even if the estrobolome story turns out smaller than hoped.
"Nobody gets to thirty by eating more salad. You get there with a spice cupboard, a seed jar and a freezer drawer."
A normal week that quietly hits 30
Here is the whole strategy: stop counting portions and start stacking variety into food you already make.
- A mixed-seed jar by the kettle: pumpkin, sunflower, flax, sesame, chia. One spoon on porridge or soup is five plants before you've thought about it.
- Mixed frozen veg: a bag of frozen Mediterranean veg or mixed greens adds three or four plants to any pan with zero chopping.
- Tinned bean mixes: a "mixed bean salad" tin scores four in one drain-and-rinse.
- One curry: a dal with onion, garlic, ginger, tomato and four spices is nine or ten plants in a single pot. Try our yellow dal with kefir tarka.
- One traybake: something like our roast vegetable and farro bowl clears another eight without any of them feeling like a portion of anything.
Two cooked meals, a seed jar, a coffee and an ordinary fruit bowl: that's a week most of us are already having, or one small shop away from having. Thirty was never the hard part. Noticing was.
Where to start tonight
If you'd like to see the ceiling, our 30-plant Sunday salad does the whole week's target in one (admittedly show-off) bowl. Otherwise browse the full collection of gut-health recipes, all built for variety on a normal budget, and read the estrobolome evidence, hedges and all, on our gut health science page.
