Why No Fruits or Vegetables on Carnivore? The Question Everyone Asks

May 26, 2026

A few weeks ago someone on r/carnivore posted a short question: "Fruits and veggies - why dont you allow these in your diet? Given that they're natural and I can't understand why they would be bad for us."

It's a good question. Honest. No snark. Exactly the kind of thing anyone would ask when they first hear about a diet that cuts out every plant on the planet.

The thread got 42 comments. Lots of thoughtful responses. And the question itself captures something important - the confusion almost everyone feels when they first encounter the idea that plants might not be the unqualified health food we've been told they are.

So let's answer it properly.

The Short Answer

Plants aren't "bad." They're just not optimal for everyone. Many people do fine eating plants. But for people with gut issues, autoimmune conditions, chronic inflammation, or metabolic problems, removing plant foods can be transformative. The carnivore diet is essentially the most extreme elimination diet - you cut everything out, heal, and then decide what to add back.

It's not that plants are poison. It's that some people are sensitive to the compounds in them, and you won't know until you try removing them.

The Longer Answer: Plants Fight Back

Plants can't run away from things that want to eat them. So they evolved chemical defenses - compounds that discourage predators. These are called anti-nutrients or plant toxins, and they include lectins, oxalates, phytates, and others.

Lectins are proteins that bind to the lining of your gut. They can cause inflammation and disrupt the barrier between your digestive tract and your bloodstream - what people call "leaky gut." They're highest in legumes, grains, and nightshades (tomatoes, peppers, potatoes).

Oxalates form sharp little crystals that can lodge in your joints, kidneys, and soft tissue. They're concentrated in spinach, almonds, beets, and rhubarb. Most kidney stones are made of calcium oxalate.

Phytates bind to minerals like zinc and iron and prevent your body from absorbing them. This is why vegetarians need higher zinc intake - the phytates in their food are blocking absorption.

Now here's the thing: most healthy people can handle these compounds in normal amounts. Your body has detox pathways. Your gut has defenses. But if your gut is already compromised - and a lot of people's are, they just don't know it - these compounds add to the inflammatory load.

We've got a detailed breakdown of plant toxins here if you want the science. This post is more about the practical question: why would you give up perfectly good vegetables?

But Aren't Plants Natural?

This is the heart of the OP's question. Plants are natural. So why avoid natural things?

Two things here. First, "natural" doesn't mean harmless. Poison ivy is natural. Arsenic is natural. The dose and the individual matter more than the source.

Second, the plants we eat today aren't the same plants our ancestors ate. Modern fruits have been bred to be much higher in sugar - a wild apple is tiny and tart compared to a Honeycrisp. Modern wheat has been hybridized to have way more gluten than ancient strains. Vegetables have been selected for yield and shelf life, not for your digestive health.

So when someone says "but our ancestors ate plants," they're not wrong. But they ate different plants in different amounts, seasonally, and prepared differently (soaking, fermenting, cooking for hours).

The Practical Test: Try It and See

The real answer to "why no plants" isn't theoretical. It's practical. Thousands of people have tried carnivore and found that their chronic issues - joint pain, bloating, brain fog, skin problems, digestive distress - went away when they removed plants and came back when they reintroduced them.

That's not a study. That's just what happens when you remove a variable and observe the result.

The carnivore diet is best understood as a diagnostic tool. You go strict for 30, 60, or 90 days. You see how you feel. Then you start adding things back one at a time and see what happens. Some people add back white rice. Some add back certain vegetables. Some realize they feel best on meat alone and never go back.

The point isn't to fear plants. The point is to figure out what works for your body. And the only way to do that is to start from zero.

The Bioavailability Problem Nobody Talks About

There's another angle that doesn't get enough attention. Even when plants contain nutrients, those nutrients aren't always accessible to your body.

The iron in spinach? Non-heme. Your body absorbs about 2% of it compared to 25% of the heme iron in beef. The vitamin A in carrots? Beta-carotene, which your body converts to active retinol at a rate of 3-5% for most people. The omega-3s in flax seeds? ALA, which converts to DHA at about 1-5%.

Animal foods give you the active forms ready to go. Retinol, not beta-carotene. Heme iron, not non-heme. DHA and EPA, not ALA. B12 that's actually there instead of zero.

So when someone says "but you can get all your nutrients from plants," the real answer is kind of - but the bioavailability is massively different. You'd need to eat a lot more plant matter to get the same usable nutrition, and that plant matter comes with anti-nutrients that block absorption of other things. It's a losing math problem for a lot of people.

So Should You Never Eat Plants Again?

Not what I'm saying. Some people tolerate plants fine. Some people do better including certain plants in their diet. The carnivore community has plenty of people who eat white rice, fruit, or honey without issues.

But if you're struggling with chronic health issues - especially gut problems, autoimmune conditions, or inflammatory symptoms - trying a zero-plant elimination period is one of the most useful experiments you can run.

The OP's question was honest and fair. It deserves an honest answer: you don't have to avoid plants forever. But you owe it to yourself to find out how you feel without them.

That's the only way to really know.

Inspired by a discussion on the carnivore subreddit.

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