You’ve spent months feeding your gut the way you’ve been told to: little and often, snacking through the day, keeping something ticking over so the good bacteria never go hungry. Three hours to eat, then nothing, feels like the opposite of that advice entirely.
That was the bit I was genuinely worried about when I tightened my eating window. Not the hunger. My gut.
I’d spent the best part of a year half-listening to Tim Spector and the ZOE research on podcasts, and the number thirty kept coming up: thirty different plant types a week for a properly diverse microbiome. Somewhere along the way I’d quietly decided that number needed grazing to hit. A four-hour window felt like the wrong tool for that particular job.
Turns out I was measuring the wrong thing.
The Grazing Myth I Never Questioned
I didn’t get the thirty-plants idea from a leaflet. I got it from Tim Spector, the gut researcher behind the ZOE study, half-heard on podcasts over the best part of a year while I was doing something else entirely. His point stuck: diversity matters more than any single food, and thirty different plant types a week is the number worth aiming for. Herbs count. Spices count. It’s an addition thing, not a restriction thing.
So I believed it. Properly believed it. And on the surface, hitching that idea to “little and often” made complete sense. Beneficial gut bacteria need feeding throughout the day, or so I’d assumed, without ever really testing it. Snack here, add a bit of veg there, graze your way to thirty plants by bedtime.
Then I tightened my eating window. Three, four hours a day, sometimes less. And the two ideas stopped sitting together. Can intermittent fasting cause bloating, or wreck the diversity I’d spent a year building? That was the actual question I typed into my own head at two in the morning.
There’s a gut doctor called Will Bulsiewicz, wrote a book I couldn’t put down, does a lot of work with the ZOE team too. He went through the American Gut Project data, the largest citizen-science microbiome study there’s been, and found people eating thirty-plus plant types a week had noticeably more diverse microbiomes than people eating ten or fewer. Didn’t matter which diet label they used. Vegan, carnivore, whatever. The number mattered. Not the eating pattern wrapped around it.
Which is a different claim to the one I’d been carrying around in my head.
What Thirty Plants in Three Hours Actually Looks Like
I’ll be straight about what kind of claim this is. This isn’t a thirteen-year, blood-test-backed claim. It’s a belief I’d been carrying for about a year, never tested, because I’d never had a reason to. I ate across a long day before this, so hitting thirty plants happened slowly, over twelve or fourteen hours. I’d never tried to hit that number inside a short window, and I assumed it wouldn’t work. When I started the 70-Day Rhythm Reset on 13 October, that was genuinely the bit I thought I’d have to sacrifice.
Windows ran anywhere from three to six hours, sometimes less, depending on the day. There was nothing to clear with my GP here (this wasn’t a medication change), but two months in, on day sixty-six of the reset, a letter landed from the surgery confirming my usual bloods. Optimal, it said. Twenty months off everything now, officially off the risk list. I want to be honest: that wasn’t down to plant counting specifically. But it sits inside the same window of change, and it told me nothing I was doing was working against me.
So I started counting properly. Every plant, every day, logged.
Day two: 26 different plants, four-hour window. Day three: 28 plants, same window length. Red pepper soup on its own had nine plants in it. Basa with a tomato salsa. Grapefruit. Nothing on that plate was obscure, and that’s what surprised me. It just wasn’t the food I’d normally reach for.
Day seven: 21 plants, mostly from a curry. Herbs and spices count, and once you start counting them, a curry becomes a proper plant-diversity event on its own.
Day twenty-two: 31 plants, six-and-a-half-hour window. Day twenty-six: 26 plants in one hour forty-five minutes, my tightest window of the lot. Day twenty-seven: 38 plants, four hours. That one was a genuine surprise, even to me.
And the day that made the thumbnail: day forty-five, 30 plants, three-hour window. My previous best, beaten, in less time than I’d been giving myself before.
Why a Tighter Window Seemed to Sharpen the Choices
Going back through the log, the pattern was consistent: the tighter the window, the more intentional the choices got. There wasn’t room for filler. No point having plain toast in a three-hour window when a mixed salad or a proper vegetable soup does more work in the same space.
Tim Spector’s ZOE team ran something called the Big IF Study: 37,000 people, a ten-hour eating window over two weeks. Energy went up by 22%, mood improved by 11%, and hunger dropped rather than rising. That’s a different mechanism to plant diversity, but the same direction of travel. Compressing the window didn’t seem to cost people something. It seemed to sharpen things.
So what does my data actually suggest, and it is one person’s data, properly logged but still just me? It suggests the grazing bit was never the mechanism. Variety was. A compressed window, if anything, seemed to force better choices rather than limit them.
The Garden Versus the Cracked Flowerbed
There’s a way of picturing this that’s stuck with me since. Think of a well-tended garden in full bloom: hundreds of different plants, rich soil, everything supporting everything else, barely room for a weed because every patch is doing something useful. That’s a diverse gut.
Now think of a cracked council flowerbed at the end of a dry August: a few tough weeds that’ll survive anything, bare compacted soil, nothing flowering. That’s a depleted one.
The difference isn’t genetic destiny. It’s what you’ve been feeding the ground for the last ten years. And it turns out how long you spend at the flowerbed each day matters less than what you actually plant while you’re there.
You’re not giving anything up by shortening the window. You’re removing the grazing that was never the thing doing the work in the first place.
When the Old Advice Still Holds
None of this means the old grazing advice is wrong for everyone. If you’ve got a diagnosed digestive condition, IBS, IBD, or you’re on a low-FODMAP diet for a reason, ramping up fibre and plant variety quickly isn’t something to do without your GP involved. That’s a genuinely different situation to mine.
And if you’re at the stage where your digestion just feels a bit off (nothing diagnosed, nothing urgent) this is worth knowing before the appointment rather than after it. What you’re eating and how often might matter more than whether you’re eating enough.
Alessio Fasano’s research backs this up more broadly. People in industrialised countries carry somewhere between 15% and 30% fewer gut bacterial species than people in non-Western nations, and that loss lines up with the rise in chronic inflammatory conditions. Worth knowing before anyone hands you a diagnosis, not after.
If you’re on medication, or managing an existing condition, the conversation to have is with your GP before you change your eating pattern significantly. Not instead of it. With it.
I’ll leave that with you.
🎯 Key Takeaways
- Grazing was never the mechanism: plant variety was the thing that mattered, not how often Neil ate
- A tighter window seemed to sharpen choices, not limit them: no room for filler foods when time is short
- 26–38 plants achieved inside 3–6 hour windows during the 70-Day Rhythm Reset, well past the 30-a-week benchmark
- Existing digestive conditions still need GP involvement before changing eating patterns significantly
- The Big IF Study found broader benefits to compressed windows beyond gut diversity: higher energy, better mood, lower hunger
Ready to Shrink Your Window Without Losing the Variety?
If tightening your eating window has ever felt like it would cost you variety, the 14-Day Rhythm Reset Guide walks through how to structure a shorter window without giving anything up.
👉 Get the 14-Day Rhythm Reset Guide (free)
💪 Want ongoing support? Join Rhythm Club for £30/month (includes FREE app access, community, and weekly accountability calls)
⚠️ Important: This is educational content based on evidence and personal experience. It is not medical advice. Speak to your GP before making changes to your fasting pattern, diet, or medication.
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