Parasites: The Problem Nobody's Talking About

Right then — let's talk about the thing most people would rather not: the idea that you might be sharing your body with something that isn't you.

I'm Pete. I've spent 15+ years in the trenches of health and fitness, I train some seriously smart people — including GPs and doctors — and I'll tell you something that surprised me the first time I heard it from one of them: parasites barely get a look-in during medical training. It's a few pages, a couple of exam questions about tropical worms, and that's about it. Not because doctors don't care — they're brilliant, hard-working people — but because the system is built to spot and treat the obvious, dramatic infections, not the low-grade, background passengers that quietly drag your health down for years.

And that's the gap I want to talk about today. Because the more you look into this — and I've gone deep down this rabbit hole — the clearer it gets: parasites are far more common, and far more responsible for everyday ill-health, than we're generally told. Bloating, fatigue, dodgy digestion, cravings, brain fog, disturbed sleep, skin that won't behave — a lot of the stuff people just "put up with" can have a parasite angle nobody ever checked.

People are waking up to this. So let this be your ultimate reference. Buckle up. Oushhhhh.

What A Parasite Actually Is

A parasite is simply an organism that lives on or in a host — you — and takes what it needs at your expense. In humans they fall into a few big camps:

• Helminths (worms) — roundworms, tapeworms, pinworms, flukes. Some are microscopic; some are frankly enormous.
• Protozoa — single-celled organisms like Giardia, Blastocystis hominis and Cryptosporidium that multiply happily inside you.
• Ectoparasites — the ones that live on the surface, like mites.

Here's the bit that surprises people: you do not have to have been to a far-flung country to pick these up. Undercooked meat and fish, unwashed salad and veg, dodgy water (at home or abroad), pets, kids' nurseries, swimming pools, gardening, even handling money — there are dozens of everyday routes in. Pinworm, for example, is incredibly common in UK households with young children and has absolutely nothing to do with travel.

Why This Flies Under The Radar

This is the honest part. It's not a conspiracy — it's a blind spot, and it comes down to a few very human things:

• It's barely taught. As I said — the GPs I train are the first to admit parasitology is a tiny sliver of the curriculum in a country that thinks of worms as "somewhere else's problem".
• The testing is genuinely poor. The standard stool test misses a lot — parasites shed intermittently, so a single sample on the wrong day comes back clear even when something's there. A lot of people get a "normal" result and are told it's all in their head.
• The symptoms are vague and shared. Fatigue, bloating and brain fog could be a hundred things. Parasites rarely make the shortlist.
• Nobody's selling it. There's no blockbuster drug, no big marketing budget, no reason for the topic to be pushed. So it just… isn't.

Symptoms People Never Connect To Parasites

No single one of these means you've got a passenger — they overlap with plenty of other things. But when a cluster of them hangs around and nothing else explains it, this is the door most people never think to open:

Notice how many of those are the exact complaints people bring to me as a coach — "I eat well and train and I'm still knackered and bloated." Sometimes the missing piece isn't the training or the diet. It's what's quietly living rent-free in the gut.

The Gut Is Ground Zero

Everything here comes back to your gut. Around 70% of your immune system lives in and around your gut wall, and your gut bacteria influence everything from mood to metabolism. A parasite doesn't just sit there — it disrupts that whole ecosystem: it inflames the gut lining, competes for your nutrients, throws off your good bacteria and can leave you deficient in iron, B12 and more even when you're eating well.

Which is exactly why the answer isn't only "kill the parasite". It's to make your body a rubbish place for one to live in the first place: a strong gut lining, a thriving microbiome, good stomach acid, and a diet that starves the bad stuff and feeds the good. Get that right and you're playing defence 365 days a year.

Anti-Parasitic Foods

This is where you, me and every kitchen in the country have real power — because a surprising number of everyday foods are genuinely inhospitable to parasites. None of these is a magic bullet on its own. Stacked together, consistently, they turn your gut into hostile territory. This is the backbone of the whole approach.

Add in bitter greens (rocket, dandelion, chicory), ginger and turmeric for the gut lining, plenty of fibre to keep things moving, and go easy on the thing parasites love most: refined sugar. Starve them, scrub the pipes, feed the good bugs. Simple, and it works quietly in the background every single day.

The Herbal Heavy Hitters

Step up from food and you're into the traditional herbal antiparasitics — the stuff naturopaths have leaned on for generations. The famous one is the classic trio, usually taken together:

• Wormwood (Artemisia) — the big name, used against worms for centuries and the source of artemisinin.
• Black Walnut Hull — traditionally paired with wormwood to target the adult parasites.
• Cloves — in there to go after the eggs, so the cycle doesn't just restart.

Others in the toolkit: oregano oil, berberine (I've written a whole piece on berberine here — it's a genuine gut all-rounder), neem, garlic extract and grapefruit seed extract. And a mention for methylene blue — the biohacker's favourite that I've covered in depth — which has real antimicrobial history alongside its mitochondrial party trick.

The Twice-A-Year Cleanse

Here's the framework I think makes the most sense — and the reason a lot of the natural-health world runs a cleanse roughly every six months. The logic is straightforward: parasites have life cycles, they lay eggs, and a one-day blast doesn't catch the eggs that hatch next week. So you run a proper window, twice a year — spring and autumn are the traditional picks.

Do that spring and autumn, keep the anti-parasitic foods ticking over the rest of the year, and you've got a rhythm that keeps you a step ahead without living like a hermit. That's the whole game: consistency over intensity, same as it is with training.

The Medication Conversation

Now the bit everyone actually wants to talk about — and the bit I'm going to give you straight, because this is emerging, fast-moving territory and you deserve the honest version rather than the hyped one.

There are proper anti-parasitic medications that are cheap, that have been used in humans for decades, and that are remarkably well tolerated at their approved doses. Two names come up more than any other:

• Ivermectin — this is a serious, credentialled drug, not a fringe one. The scientists who discovered it were awarded the Nobel Prize in 2015, and it's been given to billions of people worldwide to treat parasitic infections. At approved doses, under a prescriber, it has a very well-established safety record.
• Fenbendazole — a broad-spectrum anti-worm compound. In the UK it's currently sold as a veterinary wormer, not a licensed human medicine, and it's become one of the most talked-about compounds on the internet. There's genuine interest in whether it has wider human uses, and the conversation is only getting louder.

So yes — I'm genuinely pro people learning about this, asking better questions, and pushing their doctors to actually look into things instead of shrugging it off. The compounds are real, the science on ivermectin's antiparasitic use is rock solid, and the fenbendazole conversation is one to watch. Just do it the grown-up way: informed, supervised, and with a professional in your corner.

Myth Busting

The Bottom Line

Parasites are the health story hiding in plain sight. Not something to be scared of — something to be aware of, and to get ahead of. Build a gut that's hostile to them with real food, run a proper cleanse spring and autumn, use the herbs sensibly, and if you want to explore the medication route, do it with a doctor, properly.

Do that and you're not just dodging parasites — you're building the exact kind of robust, well-fuelled, low-inflammation body that performs better, recovers faster and ages slower. Which, funnily enough, is my whole job. Legends look after their gut. Oushhhhh.

Disclaimer: This article is for education and information only and is not medical advice, diagnosis or treatment. Parasitic infections can be serious and require proper medical assessment. Foods, herbs, supplements and medicines — including any mentioned here — can interact with medications and health conditions, and are not suitable for everyone (including during pregnancy or breastfeeding, for children, or alongside certain prescriptions). Ivermectin is a prescription-only medicine and fenbendazole is not licensed for human use in the UK; neither should ever be self-sourced or self-administered. Always consult a qualified doctor or healthcare professional before starting any cleanse, supplement, herb or medication, and before making changes if you have an existing health condition or take prescription medicine.