Medical Disclaimer: This challenge is for generally healthy adults. If you have IBS, SIBO, IBD, food allergies, or are on a medically prescribed diet, consult a registered dietitian before starting.
Why 30 Plants? The Science
The American Gut Project (10,000+ participants) found a single clear predictor of a healthy, diverse microbiome: eating 30+ different plant foods per week. People hitting this target had:
- Higher microbial α-diversity (richness + evenness)
- More short-chain fatty acid (SCFA) producers (Faecalibacterium, Roseburia, Eubacterium)
- Fewer antibiotic resistance genes
- Lower systemic inflammation markers
Average American eats ~10 plants/week. The gap is the opportunity.
What Counts as a “Plant Point”
| Category | Points per Distinct Item | Examples |
|---|---|---|
| Vegetables | 1 | Broccoli, spinach, kale, carrots, bell pepper, zucchini, eggplant… |
| Fruits | 1 | Blueberries, apple, orange, banana, kiwi, pomegranate… |
| Legumes | 1 | Chickpeas, lentils, black beans, edamame, kidney beans… |
| Whole Grains | 1 | Oats, quinoa, brown rice, barley, buckwheat, farro… |
| Nuts & Seeds | 1 | Almonds, walnuts, chia, flax, hemp, pumpkin seeds… |
| Herbs & Spices | 1 | Turmeric, cinnamon, ginger, garlic, oregano, basil, cumin… |
| Fermented Plants | 1 | Sauerkraut, kimchi, miso, tempeh, natto… |
Rules: Different varieties = different points (red vs. green pepper = 2). Herbs/spices count even in small amounts. Coffee/tea/cocoa = 1 point each. Refined grains, oils, sugar = 0.
7-Day Challenge: Hit 30 This Week
Day 1: Audit & Shop (Target: 5 points)
- Morning: Count last 7 days’ distinct plants (be honest). Write it down.
- Action: Buy 5 vegetables you haven’t eaten in 30 days (e.g., fennel, radicchio, bok choy, jicama, rutabaga).
- Meal: Big salad with 5+ veg + 2 tbsp seeds + olive oil vinaigrette. Points: 7
Day 2: Breakfast Upgrade (Target: 8 points cumulative)
- Overnight oats: Oats (1) + chia (1) + flax (1) + blueberries (1) + cinnamon (1) + kefir (1). Points: 6
- Coffee/tea: Black coffee (1) or green tea (1). Points: +1
- Running total: ~13
Day 3: Legume Day (Target: 15 points cumulative)
- Lunch: Lentil salad — lentils (1) + red onion (1) + celery (1) + parsley (1) + lemon + olive oil. Points: 4
- Snack: Hummus (chickpeas = already counted) + carrot (1) + cucumber (1). Points: +2
- Running total: ~19
Day 4: Herb/Spice Blitz (Target: 22 points cumulative)
- Dinner: Stir-fry with garlic (1), ginger (1), turmeric (1), cumin (1), coriander (1), bok choy (1), bell pepper (1), snap peas (1), tofu + brown rice (1). Points: 9
- Running total: ~28
Day 5: Fermented + Nut Diversity (Target: 30+ points!)
- Breakfast add-on: Sauerkraut (1) or kimchi (1) + walnuts (1) + pumpkin seeds (1). Points: +3
- Afternoon: Apple (1) + almond butter (already counted) + dark chocolate 85% (cocoa = 1). Points: +2
- Running total: ~33 ✓
Day 6: Maintain & Track
- Repeat favorites from Days 2–5. Aim for 35+ this week.
- Note how you feel: bloating, energy, stool (Bristol 3–4), sleep.
Day 7: Reflect & Plan Week 2
- Final count. Celebrate.
- Identify 5 new plants for next week.
- Batch-cook: roast tray of 5 veg, cook pot of grains/beans, prep herb mixes.
Shopping List: 30 Plants for ~$50
| Category | Buy These (1 each = 1 point) | Est. Cost |
|---|---|---|
| Veg (10) | Spinach, broccoli, carrots, red onion, bell pepper, zucchini, sweet potato, arugula, tomato, avocado | $15 |
| Fruit (5) | Frozen berries, apples, banana, lemon, avocado (also veg) | $10 |
| Legumes (3) | Dry lentils (1 lb), canned chickpeas, canned black beans | $4 |
| Grains (3) | Rolled oats, quinoa, brown rice | $6 |
| Nuts/Seeds (5) | Almonds, walnuts, chia, flax, pumpkin seeds | $12 |
| Herbs/Spices (5+) | Garlic, ginger, turmeric, cinnamon, cumin, oregano, basil, black pepper | $8 (pantry staples) |
| Fermented (2) | Sauerkraut (raw), kefir or yogurt (plain) | $6 |
Troubleshooting
| Issue | Solution |
|---|---|
| Bloating/gas increase | Normal week 1–2. Increase slowly: +2 plants/week. Cook veg well. Try PHGG supplement. |
| IBS/FODMAP sensitivity | Use Monash app. Focus on low-FODMAP plants: spinach, carrot, zucchini, green beans, quinoa, firm tofu, pumpkin seeds, strawberries, orange, oats. |
| Time/prep burden | Batch cook Sunday: roast 2 trays veg, cook 2 grains, 1 legume. Frozen veg = same points, less prep. |
| Kids/picky eaters | Smoothies (spinach + berries + banana), hidden veg in sauces, “build your bowl” nights. |
Beyond Week 1: Make It Permanent
- Seasonal rotation: Eat what’s in season — natural diversity.
- International cuisines: Mediterranean, Japanese, Indian, Mexican, Ethiopian — each adds 5–10 new plants/week.
- Grow something: Herbs on windowsill, sprouts in jar — freshest points possible.
- Track quarterly: Re-count every 3 months. Life changes; diversity drops without attention.
Frequently Asked Questions
Do herbs and spices really count?
Yes. The American Gut Project explicitly counted them. Polyphenols and antimicrobial compounds in herbs/spices selectively modulate microbiota. 1 tsp turmeric + 1 tsp cinnamon + 2 cloves garlic = 3 points.
What about coffee, tea, chocolate?
Coffee (1), green/black tea (1), cocoa powder 100% (1). They’re plant-derived and provide polyphenols. No sugar/milk added.
Can I get 30 on a low-FODMAP diet?
Harder but possible. Focus: oats, quinoa, rice, firm tofu, tempeh, spinach, carrot, zucchini, green beans, bok choy, strawberries, blueberries, orange, kiwi, pumpkin seeds, walnuts, chia, basil, oregano, ginger, turmeric. Requires more planning.
References
- McDonald D, et al. “American Gut: An Open Platform for Citizen Science Microbiome Research.” mSystems. 2018;3(3):e00031-18. PMID: 29790537
- Wastyk HC, et al. “Fermented Food Intake Increases Microbiome Diversity.” Cell. 2021;184(15):3987-4001. PMID: 34237336
- Singh RK, et al. “Influence of Diet on the Gut Microbiome.” J Transl Med. 2017;15(1):73. PMID: 28351390
- Monash University. “Low FODMAP Diet App.” 2024.
