How Many Different Plants Should You Eat for Better Gut Health?
When people think about improving their gut health, they often focus on one food.
Should I eat kefir?
Should I take probiotics?
Should I eat more fibre?
But there is another question that deserves more attention:
How much variety is there in your diet?
Your gut microbiome is not made up of one type of microorganism. It is a complex community, and the foods you eat provide different types of fibre and plant compounds that interact with that ecosystem.
This is why dietary diversity may be more useful than constantly searching for one perfect gut-health food.
What does "plant diversity" mean?
Plant diversity simply means eating a variety of foods that come from plants.
That includes:
- Vegetables
- Fruits
- Beans
- Lentils
- Chickpeas
- Whole grains
- Nuts
- Seeds
- Herbs
- Spices
Each plant contains its own combination of fibres, carbohydrates, vitamins, minerals and plant compounds.
So eating a bowl containing several different vegetables is nutritionally different from eating the same vegetable every day.
Why does variety matter to the gut?
Different microorganisms can use different nutrients and dietary substrates.
When your diet contains a broad range of plant foods, you are also exposing your gut microbiome to a wider range of fibres and other compounds.
This is one reason dietary diversity is increasingly discussed in microbiome research.
Importantly, this doesn't mean:
More plant foods = automatically better health.
The relationship between diet and the microbiome is complex, and individual responses differ.
But eating a varied diet is a practical way of increasing the range of nutrients and plant compounds available to your body and gut microorganisms.
What about the "30 plants a week" idea?
You may have heard the advice to aim for 30 different plant foods per week.
The idea gained popularity following research from the American Gut Project, which found associations between greater plant-food diversity and microbial diversity.
But it's important not to treat "30" as a medical target that everyone must hit.
You don't fail at gut health because you eat 18 different plants in a week.
And eating 30 different plant foods doesn't guarantee that your microbiome is healthy.
The useful takeaway is much simpler:
Try to increase the variety of plant foods you eat.
Think of 30 as an inspiration for variety, not a pass-or-fail score.
What counts as a different plant?
This is where you can make the challenge surprisingly easy.
For example:
- Spinach
- Carrot
- Tomato
- Onion
- Garlic
- Broccoli
- Cabbage
- Beetroot
- Pumpkin
- Green beans
That's already 10 different plant foods.
Then add:
- Apple
- Banana
- Orange
- Berries
Now you're at 14.
Then:
- Lentils
- Chickpeas
- Kidney beans
- Oats
- Brown rice
- Peanuts
- Pumpkin seeds
- Sesame seeds
And you've quickly built a much more diverse diet.
Herbs and spices can also contribute to dietary variety.
Variety doesn't mean expensive superfoods
You don't need chia seeds from an imported health-food store, exotic berries or expensive powders to improve plant diversity.
Many affordable foods count.
Think about foods commonly available in South Africa:
- Beans
- Lentils
- Maize
- Pumpkin
- Sweet potato
- Spinach and other leafy greens
- Cabbage
- Carrots
- Tomatoes
- Onions
- Apples
- Bananas
- Citrus
- Peanuts
- Local herbs and vegetables
The goal isn't to build the most Instagram-worthy smoothie bowl.
It's to eat a wider range of ordinary plant foods.
What if vegetables make me bloated?
This is important.
If your diet has been relatively low in fibre and you suddenly start eating large amounts of vegetables, legumes and whole grains, you may notice more gas or bloating.
That doesn't automatically mean your gut "can't handle fibre".
Your digestive system may simply need time to adapt.
NuMeSA's existing digestive-health guidance similarly recommends introducing fibre and gut-supportive foods gradually, particularly when digestion is sensitive.
Try:
Instead of: dramatically changing your diet overnight.
Try: adding one new plant food every few days.
You can also begin with smaller portions of beans and other foods that you know tend to produce more fermentation.
Variety is more than vegetables
One common mistake is thinking:
"I eat vegetables every day, so my diet is diverse."
Vegetables are excellent, but plant diversity includes much more.
Try rotating between:
Legumes
Beans, lentils and chickpeas.
Whole grains
Oats, brown rice, sorghum, millet and other whole grains.
Fruits
Choose different colours and types throughout the week.
Nuts and seeds
Peanuts, almonds, sunflower seeds, pumpkin seeds and others.
Herbs and spices
Cinnamon, ginger, turmeric, coriander, parsley and other herbs and spices can add variety.
Starchy vegetables
Sweet potato, pumpkin and other root vegetables.
The point isn't to obsess over the numbers.
It's to stop eating the exact same five foods every day.
Think about colour
A very simple way to increase variety is to think about colour.
Try to include:
Green: spinach, broccoli, peas
Orange: carrots, pumpkin, sweet potato
Red: tomatoes, peppers
Purple: cabbage, beetroot, aubergine
Yellow: maize, yellow peppers, squash
Blue/purple: berries when available
Different colours often reflect different plant compounds.
This is not a perfect scientific measurement of microbiome diversity—but it is a very practical way to make your meals more varied.
Keep a plant-food list
Want to make this easier?
Create a simple list on your phone.
Every time you eat a new plant food, add it.
You might discover that you eat far more variety than you thought.
Or you might notice that you rely heavily on the same few foods.
Either way, you've learned something useful.
What about fermented foods and probiotics?
Plant diversity doesn't replace fermented foods or probiotics.
It is simply another part of the bigger picture.
NuMeSA already has educational resources explaining probiotics, prebiotics and fermented foods, including its Prebiotics vs Probiotics Guide.
The important distinction is:
Probiotics are live microorganisms that, when consumed in adequate amounts, confer a health benefit.
Prebiotics are substrates selectively used by host microorganisms that provide a health benefit.
Plant diversity gives you a broad mixture of fibres and plant compounds rather than one single nutrient or microorganism.
These concepts can work together within an overall dietary pattern.
Your goal isn't a perfect microbiome
There is no single "perfect" microbiome.
Microbiomes vary between people because of differences in diet, age, environment, medications, genetics and many other factors.
So don't let gut-health advice become another source of stress.
You don't need to eat 30 plants every week.
You don't need a cupboard full of supplements.
You don't need to completely change your diet.
Start with one simple goal:
Eat something different tomorrow.
Then another new plant food the day after.
Over time, those small additions can create a much more varied diet.
A simple weekly challenge
Try this:
Monday: Add a new vegetable.
Tuesday: Try a different fruit.
Wednesday: Add beans or lentils.
Thursday: Try a different whole grain.
Friday: Add a new seed or nut.
Saturday: Experiment with a new herb or spice.
Sunday: Choose something you haven't eaten recently.
By the end of the week, you've already expanded your plant-food variety.
Final thoughts
Gut health doesn't have to revolve around finding one miracle food.
Your microbiome is an ecosystem, and your overall diet helps shape the environment in which that ecosystem exists.
One of the simplest things you can do is increase the variety of plant foods you eat.
Don't worry about hitting an arbitrary number.
Instead, ask yourself:
"How many different plants have I eaten this week?"
Then see if you can add one more.
For more practical, beginner-friendly information, explore NuMeSA's Gut Health Guides Hub