How to Eat 30 Plants a Week (and What Counts)

This guide covers where the number comes from, what counts, and a realistic way to get there in an ordinary week.

Where the number comes from

The 30-plant target comes from the American Gut Project, a large citizen-science study published in 2018 that collected gut samples from over 10,000 people across the US, UK and Australia. Tim Spector of King's College London led the UK arm (the British Gut Project).

The finding was specific: participants who ate 30 or more different types of plant a week tended to have a more diverse gut microbiome than those who ate 10 or fewer. That makes plant variety an interesting and practical marker, but it does not turn 30 into a medical cut-off.

Be precise about what the study showed: an association between plant variety and microbiome diversity in a large observational dataset, rather than proof that hitting exactly 30 prevents or cures anything. The useful principle is to eat a broader range of plant foods, not to chase a perfect score.

The headline shift, in Spector's framing: the old "five a day" was about quantity; "30 plants a week" is about diversity. He describes the gut as a garden that does better planted with many different species than with a lot of one.

Why variety beats counting calories (for your gut)

Most diet advice is about less. Fewer calories, less fat, less sugar. Gut health is one of the few areas where the advice is about more and more varied. That's a big part of why I built a product around it: advice about "more" is advice people enjoy following.

Different plants feed different gut bacteria. Broccoli, oats and black beans each keep different microbes happy; no single food feeds them all. That's why a diet built on three or four "healthy" staples can still leave your gut under-fed. The range is what matters.

This connects to a quieter UK problem: fibre. Government guidelines recommend adults eat 30g of fibre a day, but the latest National Diet and Nutrition Survey found that 96% of adults did not meet the recommendation. Plant variety and fibre go hand in hand: the foods that widen your plant count, including pulses, wholegrains, nuts, seeds and veg, are the same foods that help close the fibre gap.

What counts as a plant (the full list)

This is where most people undercount. Plants go well beyond the vegetables on your plate, and every one of these counts as a "plant point," and each counts once per week:

A sensible way to count:

• Do not game the number. Eat normal amounts of the main plant foods. Small amounts of herbs and spices contribute, especially when you use them regularly, but a token pinch is not a substitute for fruit, vegetables, pulses or wholegrains.
• Variety, not repetition. Eating spinach three times this week is still one plant point. The week resets the count.
• Different types of the same plant don't multiply. A red apple and a green apple are one point. But different species do count separately: a chickpea and a kidney bean are two.
• Herbs and spices are the cheat code. A spice-heavy curry or a herby dressing can add five or six plant points to a single meal.

A realistic week

No spreadsheet needed. Ordinary meals stack up fast:

• A bowl of porridge with berries, nuts and seeds: oats, blueberries, almonds, chia, flax = 5 plants.
• A chickpea and veg curry: chickpeas, onion, garlic, tomato, spinach, plus cumin, turmeric, ginger, coriander = 9 plants.
• A simple lunch salad: mixed leaves, cucumber, pepper, avocado, pumpkin seeds, olive oil, a squeeze of lemon = 7 plants.

That's three meals and you're already past 20, with overlaps trimmed. Add a couple of snacks (an apple, a handful of walnuts) and one more varied dinner, and 30 is in reach by Sunday.

Keeping track is the hard part: remembering which ones you have had, and not defaulting to the same five all week.

The catch: keeping count is the hard part

Most people who try the 30-plant challenge hit the same wall. You start a tally in a notes app, forget it by Wednesday, and never find out whether you hit the target or stalled at 14. I know because that was me.

This is one of the bits of food admin Chop it can take off your hands. Keep the recipes you want to cook in one library, whether they started in ChatGPT, a cookbook, a website or a social post. Once you plan the week, the Weekly Diversity Score gives you a view of plants, fibre and protein across those meals, so you can spot repetition without maintaining a tally in Notes.

The score supports the bigger job: keeping every good recipe, then moving it through a plan, one shopping list and the kitchen. It should help you widen a week you actually want to eat, not turn dinner into homework.

It won't cook for you, and 30 plants is achievable with a notebook and some discipline. But if tracking is what's beaten you before, having the count kept automatically is what turns it from a one-week experiment into a habit.

Frequently asked questions

How many plants should I eat a day? There's no official daily plant target. The guideline is weekly: 30 different plants across the week. Spread across a week that's roughly four to five different plants a day, which a couple of varied meals easily covers.

Do herbs and spices count? Yes. Fresh and dried herbs and spices contribute to variety. Because we usually eat them in small amounts, ZOE suggests using them several times across the week rather than treating one tiny pinch as a complete job done.

Does coffee count as a plant? Yes. Coffee, tea, dark chocolate (70% cocoa or higher) and extra-virgin olive oil all count, because they're rich in the beneficial plant compounds (polyphenols) gut bacteria feed on. Enjoy them in normal moderation; they're a bonus, not a strategy.

Is 30 plants a week the same as five-a-day? No. Five-a-day counts portions of fruit and veg for general health. 30 plants counts the variety of all plant foods (including grains, pulses, nuts, herbs and spices) specifically to support a diverse gut microbiome. They work together. Hitting 30 plants will usually take care of five-a-day too.

What if I have IBS or a sensitive gut? Increase variety and fibre gradually, and drink plenty of water. A sudden jump can cause bloating and gas while your gut adjusts. If you have IBS or a diagnosed gut condition, some fermentable fibres can trigger symptoms, so check with your GP or a dietitian before making big changes.

Does it have to be exactly 30? No. 30 is a memorable target from the research, not a magic threshold. The principle is "more variety is better." Going from 10 to 20 different plants is a meaningful improvement on its own. Aim in the right direction rather than obsessing over the exact number.

Can I hit 30 plants on a budget? Yes. Tinned beans, frozen mixed veg, oats, a bag of mixed seeds and a spice rack are cheap and each add multiple plant points. Variety asks for different ingredients rather than expensive ones. Frozen and tinned count exactly the same as fresh.

The bottom line

Eating 30 plants a week asks you to add rather than cut: a wider range, no banned foods and nothing to weigh. The underlying study is observational and 30 is not a magic threshold, but widening the mix of plants you eat is a useful, achievable direction.

Start by counting one normal week. You'll probably land between 10 and 20, and be surprised it isn't higher. Then add the easy wins: a mix of seeds on your breakfast, beans in a stew, an extra herb or spice, a vegetable you don't usually buy. The count climbs fast once you stop repeating the same staples.

Sources: the American Gut Project paper, ZOE's current guide to 30 plants a week, NHS fibre guidance and the National Diet and Nutrition Survey 2019 to 2023.