When we think about eating well, we usually focus on quantity: more vegetables, more fibre, more protein.
But gut health researchers have been pointing to something else entirely — diversity. What matters isn't only how much plant food you eat, but how many different kinds.
Why variety matters
Your microbiome is made up of trillions of organisms, and different bacteria feed on different things. Some prefer certain types of fibre; others feed on plant polyphenols — the compounds behind the vivid colours in vegetables, fruit, herbs and spices.
Eat the same handful of foods on repeat, and only some of your bacteria get what they need. Widen the variety, and you create room for far more of them to thrive.
What the research shows
The American Gut Project — one of the largest microbiome studies to date, with over 10,000 participants across the US, UK and Australia — found a clear pattern: people who ate 30 or more different plant foods a week had a noticeably more diverse microbiome than those eating fewer than 10. They also showed more of the bacteria linked to gut wellbeing, and higher levels of the beneficial compounds produced during fermentation.
Before the number 30 feels intimidating: it includes vegetables, fruit, legumes, whole grains, nuts, seeds, herbs, spices, tea and coffee. A bowl of oatmeal with apple, walnuts, chia seeds and cinnamon is already five different plant sources in one breakfast.
Where to start
Not with counting, with curiosity.
Notice how often the same foods show up on your plate.
Then, gradually:
▫️ rotate your grains
▫️ try a new type of legume
▫️ add more herbs
▫️ experiment with different spices
▫️ choose fruit and vegetables in different colours
This week's version of self-care might simply be one question:
what's one new plant food I can add to my plate? 💚
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