I talk about this a lot, and you are probably sick of hearing about it. I know my kids are.

For good health, aim for 30 or more different plants each week.

It’s a simple idea, but for a lot of people it feels daunting. Usually when I say this, people start counting in their head and wondering how they would even get there. Which is why it’s worth understanding what actually sits behind that number.

It starts with your gut

At the centre of the 30+ plants per week recommendation is your gut. More specifically, your gut microbiome, the trillions of bacteria living in your digestive system that influence far more than just digestion.

We now know that these microbes play a vital role in key systems in your body including:

• your immune system
• your metabolism
• your energy levels
• your hormone production
• your mood, including your levels of anxiety, and
• your overall inflammatory state.

There’s a way of thinking about this that really brings it to life. By cell count, you are actually about 50–60% microbial. You are not just a single human organism, you are a walking ecosystem. A superorganism made up of human cells and microbial cells working together.

So if you are mostly microbial, and the gut microbiome is the system that drives so much of how you feel and how your body functions, the question then becomes, what are you doing to support that system?

Where the “30 plants” idea comes from

The idea of aiming for 30 or more plants each week didn’t come out of nowhere. It comes from research known as the American Gut Project, one of the largest studies exploring the human microbiome.

What they found was simple but powerful. People who ate 30 or more different plant foods each week had significantly more diverse gut microbiomes. That is, they had more different types of bacteria in their gut.

And why is this bacteria diversity important? Because a more diverse microbiome is consistently linked with better health outcomes.

Your diet is one of the biggest drivers

One of the clearest findings from recent research is this: your diet is one of the most powerful drivers of your gut microbiome. Large-scale studies have shown that what you eat can predict the vast majority of your gut bacteria and what they are doing.

That matters, because those microbes are not passive. They take what you feed them and turn it into signals that influence your body, from inflammation to metabolism to brain function and even how you age.

Which means your daily food choices are not just about energy or nutrients. They are shaping how your body operates, in a way that builds over time.

Why plant diversity matters

This is where plant diversity becomes so important.

Different plant foods contain different types of fibre, and these fibres act as fuel for different types of gut bacteria. You can’t supplement your way around this. Those fibres are only found in plant foods, and they are what allow beneficial microbes to grow and function.

Alongside fibre, plants also contain compounds called polyphenols. These are natural chemicals that give plants their colour, flavour, and protective properties. In the body, they act as antioxidants and anti-inflammatory compounds, and they also feed and shape the microbiome.

This is where the idea of eating the rainbow comes from. Different colours reflect different polyphenols, and different polyphenols support different microbial activity. The more variety you eat, the more diverse the inputs into your system.

When you eat a narrow range of plants, you feed a narrow range of microbes. When you eat a wide variety, you support a more diverse and resilient microbiome. And that diversity is consistently linked to better health outcomes.

It’s also worth saying what this doesn’t mean. It’s not about picking 30 plants and eating the same ones on repeat. That’s not true diversity. The goal is variety over time. The wider the range of plants you eat, the more diverse the inputs into your system.

The problem with the modern diet

The challenge is that most people in the Western world eat a surprisingly limited range of plants. A large proportion of caloric intake in the west comes from just a handful of foods, typically wheat, rice, soy, and potatoes.

Even when people feel like they are eating well, there is often very little diversity in what they are actually consuming week to week.

This creates a kind of monoculture in the gut. The same foods, feeding the same microbes, over and over again. Over time, this lack of diversity can limit the resilience and functionality of the microbiome.

You can’t supplement your way out of this

There is a growing body of research looking at supplements, probiotics, and quick fixes for gut health. But the consistent finding is that you cannot build a healthy microbiome without the right dietary inputs.

You can’t out-supplement a low-diversity diet.

Your gut bacteria need fibre to survive and function, and that fibre comes from whole plant foods. Without it, even the “good” bacteria struggle to establish and do their job.

This is why the focus needs to come back to what you are eating every day, and the pattern over time.

Variety over perfection

This is the part that often gets missed. You don’t need a perfect diet, and you don’t need to overhaul everything you eat. What matters more is the pattern you repeat.

Your microbiome is relatively stable and reflects your habits over time, not what you happened to eat on a single day. Small, consistent changes are what shift it. Focusing on adding variety is far more effective than trying to follow strict rules or short-term intense eating plans that can’t be sustained.

What 30 plants actually looks like

When you start to look at it this way, the idea of 30+ plants becomes much more practical. It is not about trying to fit 30 different vegetables into a single meal (although with Daily Blend this is easy!). It is about what your week looks like as a whole.

Oats, nuts, seeds, fruits, vegetables, leagues and pulses, herbs and spices all count. Even coffee and tea counts. Once you start noticing, it becomes clear how quickly variety can build when you shift your focus from restriction to inclusion.

This is exactly why I created Daily Blend. To help people get to 30 or more plants each week in a way that is quick, simple and realistic. Not as a supplement. But as a way to increase plant diversity in meals you are already eating, without needing to rethink your entire diet.

The bigger idea

This isn’t about hitting a perfect number each week. It is about understanding what actually makes a difference and then making that easy to do consistently.

You are feeding an entire ecosystem every time you eat. And that ecosystem plays a central role in how you feel, function and age.

The great news? One of the most effective things you can do for your overall health now and for your future self is to regularly feed your gut microbiome a wide variety of plant foods. Food literally is your medicine.