---
url: https://mangia-app.com/en/30-plants-per-week
title: 30 plants a week — what's behind it? — mangia
description: 30 different plants a week — where does the number come from, what counts, and how do you manage it without a calorie app? Study, sample week, practical tips.
locale: en
type: article
author: mangia editorial
date_published: 2026-05-20
date_modified: 2026-05-20
app_url: https://mangia-app.com/app-laden
alternate_languages:
  de: https://mangia-app.com/30-pflanzen-pro-woche
  fr: https://mangia-app.com/fr/30-plantes-par-semaine
  it: https://mangia-app.com/it/30-vegetali-a-settimana
  es: https://mangia-app.com/es/30-plantas-por-semana
---
# 30 plants a week — what's behind it? — mangia

> 30 different plants a week — where does the number come from, what counts, and how do you manage it without a calorie app? Study, sample week, practical tips.

**Autor:** mangia editorial · **Veröffentlicht:** 2026-05-20 · **Aktualisiert:** 2026-05-20 · **Lesezeit:** 10 min

*We've been testing what makes cooking easier since 2024, and writing about what we learn along the way.*

*Microbiome & diversity*

## 30 different plants a week — what does that mean, and can you really manage it?

Tim Spector and the American Gut Project worked with a number that has occupied the nutrition world ever since: **30 different plants a week**. Sounds like a lot — it isn't, once you understand what counts. Here's the study, the definition, and three weekly strategies to hit it without a tracker.

## Where does the number 30 come from?

The number comes from the **American Gut Project**, one of the largest citizen-science studies on the human microbiome (McDonald et al., _mSystems_ 2018). Over 11,000 participants sent in stool samples and a questionnaire about their eating habits. The researchers grouped participants by the number of different plants they ate per week — and compared the diversity of their microbiome (the number of different bacterial species in the gut).

The result: participants who ate **30 or more different plants a week** had a markedly more diverse microbiome than those eating **10 or fewer**. Diversity rose linearly — the more plants, the more diverse the microbiome, with no visible plateau up to around 50 plants.

**Tim Spector** (co-founder of ZOE, professor at King's College London) popularised this number in his books (_The Diet Myth_, _Food for Life_) and the ZOE app. That's why it circulates today in food blogs and talk shows as «the 30-plant tip».

Important: 30 isn't a medical threshold. It's an empirically determined correlation point at which microbiome diversity clearly took off in the study. The causality (more plants → more diverse microbiome → better health) is plausible, but not proven by RCTs. What we do know: eating a variety of plants very likely does no harm, and correlates with positive health markers. You don't need more than that to give it a try.

## Why plant diversity — and not simply «lots of vegetables»?

You could eat 500 g of broccoli every day. That'd be a lot of plant, but only **one** plant. The microbiome studies show: **the number of different bacterial species in your gut rises with the number of different fibres you eat** — not with sheer quantity.

Different plants bring different fibres and polyphenols:

- **Broccoli** delivers sulforaphane and insoluble fibre.
- **Tomatoes** deliver lycopene and pectin.
- **Lentils** deliver resistant starch and saponins.
- **Blueberries** deliver anthocyanins.
- **Walnuts** deliver omega-3 and ellagic acid.

Each of these substances feeds different gut bacteria. High diversity → more bacterial species → more short-chain fatty acids (butyrate, acetate, propionate), which in turn are linked to inflammation regulation, insulin sensitivity, and even mood.

The rule of thumb from microbiome research: **more different plants = a more robust microbiome**. A more robust microbiome better withstands stress (antibiotics, illness phases, irregular eating).

That's the substantive reason behind the 30-plant recommendation. Not «plants are healthy» (we knew that), but «the **diversity** of plants is healthy, and you can actively aim for it».

## What counts as a plant?

Spector and the ZOE team deliberately kept the definition broad — that's what makes the 30 mark realistically reachable. These count:

- **Vegetables**: any kind, fresh, frozen, dried, fermented (sauerkraut, kimchi)
- **Fruit**: fresh, dried (raisins, dates), frozen
- **Legumes**: lentils, beans, chickpeas, peas, soybeans
- **Nuts and seeds**: walnut, almond, cashew, sunflower seed, sesame, chia seeds, flaxseed
- **Whole grains**: oats, rye, millet, quinoa, buckwheat, brown rice
- **Mushrooms**: any kind, fresh or dried (button mushroom, porcini, shiitake)
- **Herbs**: fresh or dried — parsley, basil, thyme, oregano
- **Spices**: turmeric, cinnamon, cumin, pepper, paprika, ginger

**What doesn't count** (or only once, not twice): processed plant products without fibre (white flour, vegetable oil, sugar), and the same plant type in different forms (a fresh tomato and tomato paste are the same plant, not two).

Key points:

- A salad bowl with cucumber, tomato, carrot, radish, chives, sunflower seeds, olive = **7 plants** in one meal.
- A Buddha bowl with quinoa, chickpeas, spinach, avocado, sweet potato, red cabbage, sesame, parsley = **8 plants** in one bowl.
- You don't need 30 different meals — you need a week in which diversity adds up.

## Is 30 in 7 days really doable?

An average Swiss mixed-diet week contains, by our sample (50 weekly plans from mangia balances, anonymised): **18–22 different plants**. So 30 is no walk in the park, but it's realistic — with two small adjustments.

The model that in practice almost always reaches 30+:

- **2× per week a bowl or a salad plate with ≥ 5 different plants** (bowl, Buddha bowl, mixed salad) → 10 plants
- **1× per week a stew / soup with legumes and several vegetables** → +5 plants
- **Oats with berries and nuts for breakfast 2–3× per week** → +4 plants
- **Spices and herbs in every warm meal** (turmeric, pepper, thyme, parsley) → +5 plants
- **Remaining normal main meals** → +6–8 plants

→ Total: **30–32 plants**, without having to «eat healthy», without having to learn to buy new foods, without extreme prep.

The trick isn't «eat more» — it's «**combine deliberately**». Instead of just carrot with the risotto: carrot plus parsley plus pine nut plus a little lemon zest. Four plants instead of one, five seconds of extra work.

That's also why the recommendation isn't a diet. It's a heuristic for shopping and seasoning — you don't have to skip any meal, you just have to eat a bowl once a week and not ignore spices.

## How mangia counts your plant diversity

In mangia there's a **Balance** tab that shows you nutrition statistics for your weekly plan — macros, minerals, vitamins, and since early 2026 also **plant diversity**.

How it works in practice:

1. mangia knows the plant name for every ingredient (e.g. «tomato» — whether you entered «cherry tomatoes», «plum tomatoes» or «tomatoes»)
2. The balance looks across all recipes you've planned or cooked in the current week
3. It counts **different plants** — tomato sauce and tomato slices are one, not two
4. Spices and herbs count from a minimum amount (e.g. ≥ 0.5 g) — otherwise «a pinch of sage from the neighbour» would count out of all proportion

The result: on the Balance tab you see a number like **«23 / 30 plants this week»**. You can directly see which are missing, and if needed plan in another salad or bowl.

No extra app, no photo tracking, no manual typing — everything flows automatically from your weekly plan into the balance. If you _don't_ plan, but cook spontaneously: that flows in too, as soon as you mark the recipe as «cooked».

**Note**: the plant-diversity display is part of mangia Pro (the optional upgrade module). In the free version you see the other balance values (macros, minerals), but not plant diversity.

## Three simple strategies for a 30-plant week

Knowing this in theory is one thing. Doing it consistently in daily life is another. Three strategies from practice:

**1. Bowl Sunday.** Once a week, on Sunday: a big Buddha bowl as lunch, in which you _deliberately_ use up leftovers from the fridge drawer. 5–8 plants in one bowl, creatively combined. That covers nearly 30 % of your weekly goal and uses up supplies along the way that would otherwise go off.

**2. Market instead of supermarket.** If possible, once a week to a weekly market. Markets force seasonality on you (what's on the supermarket shelf in November is partly imported in November) and specialities (heirloom carrot varieties, Jerusalem artichoke, parsnips). You almost automatically end up with 5–6 additional plants per weekly shop that you'd have overlooked at the supermarket.

**3. Spice tray in your line of sight.** Put the five spices you rarely use (turmeric, cumin, fennel seeds, sumac, smoked paprika) in a visible row in the kitchen. When you walk past them, you automatically reach for them more often. From research on _decision architecture_: what you see, you use. What's at the back of the cupboard, you forget.

The three strategies together aren't a diet — they're a small shift in shopping and seasoning habits. The 30-plant mark then becomes more of a by-product than a goal.

To get started, try [quick, plant-rich weeknight recipes](/rezepte) — pick one, and the diversity is counted automatically in the balance.

## Common questions

**Does 1 apple count the same as 1 gram of apple?**

Yes — the study counts _different_ plants, not amounts. 1 apple = 1 apple. That makes the mark fair, because it doesn't reward «eat more» but «eat more variety». A tomato and a carrot are two plants, whether 50 g or 200 g. The minimum amount only matters for spices, where a homeopathic pinch shouldn't seriously count as a whole plant.

**Does tomato in sauce count the same as a whole tomato?**

Both count as «tomato» — so once, not twice, in the same week. But: cooked and raw tomatoes have different active compounds (lycopene in cooked tomatoes is more bioavailable). The 30-plant mark is a rule of thumb for diversity, not a substitute for also preparing foods in different ways.

**What about spices — do they really count?**

Yes, ZOE and Spector explicitly count spices and herbs. They contain dense concentrations of polyphenols that measurably influence the microbiome (e.g. turmeric → bifidobacteria). In mangia the balance sets a minimum amount so a homeopathic pinch doesn't count out of proportion — but for normal amounts (e.g. 1 tsp turmeric in a curry) it counts.

**Is 25 plants / week enough too?**

Probably yes — the study shows a gradual, linear effect between 10 and 50. 30 isn't a threshold where something «clicks». 25 is clearly better than 15, and 30 is marginally better than 25. Doggedly hitting 30 isn't worth it; becoming more varied always is.

**Where do I see my plant count in mangia?**

In the **Balance** tab inside the weekly-plan area. You see the current week with «X / 30 plants», and can click to see the concrete plants already in there. Available as part of mangia Pro.

**I eat tons of broccoli — do I automatically have a healthy diet?**

Broccoli is an excellent food. But 500 g of broccoli a day = one plant per week, not 30. The evidence says: your microbiome would benefit from _additional_ diversity — you're not «in deficit», but you're using only a small part of what plant-based eating could deliver.

## Sources

- [McDonald et al., American Gut Project — mSystems (2018)](https://journals.asm.org/doi/10.1128/mSystems.00031-18)
- [ZOE — Tim Spector über Pflanzen-Diversität](https://zoe.com/learn/30-plants-a-week)
- [Tim Spector — Food for Life (Buch, Penguin 2022)](https://www.penguin.co.uk/books/449604/food-for-life-by-spector-tim/9781787333604)
- [Megan Rossi — The Gut Health Doctor](https://www.theguthealthdoctor.com/)
- [NHS — Dietary Fibre Guidance](https://www.nhs.uk/live-well/eat-well/digestive-health/how-to-get-more-fibre-in-your-diet/)

## Related

- **[Not just recipes](/nicht-nur-rezepte)** — What mangia does that a plain recipe app can't.
- **[Nutrition balance](/ernaehrungs-bilanz)** — A weekly review of everything you cooked — including the plant-diversity score.

## 30 plants, counted automatically.

Plan your week in mangia, cook as usual — the balance counts along.

→ **Start free**