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Short answer: no, mushrooms are not part of a strict carnivore diet. They're a fungus, not an animal food. They are low in carbs, though, and plenty of people who eat mostly meat choose to add a few. That's a personal call, not a failure.
Here's the lane we teach at Carnivore Weekly: animal foods first, and strict carnivore as our default. Mushrooms sit just outside that lane. If you step outside it, I'd like you to know you've done it on purpose, so you can tell what's helping and what isn't. If you're still working out how much to eat in the first place, our free macro calculator is a calm place to start.
What "strict" and "mostly" actually mean
These words get thrown around like everyone agrees on them. They don't, so let me define them.
- Strict carnivore: meat, fish, eggs, animal fats, salt, and water. Many people add coffee, which we're fine with. Dairy is optional, not required.
- Mostly carnivore: the same base, plus a small number of plant foods you choose on purpose, such as a few mushrooms, an avocado, or some herbs.
Neither one is "right" for everyone. But mixing them without noticing is where people get confused. If you add three new foods in one week and feel bloated, you won't know which one did it.
Where mushrooms fall
Mushrooms aren't plants and they aren't animals. They're their own group. They're low in carbohydrate compared with most vegetables, which is why they tempt people who miss cooked vegetables. A pan of mushrooms in butter smells like comfort, and I understand the pull.
But they don't count as an animal food, so they don't belong in a strict approach. They also aren't a nutrition requirement. Meat, fish, and eggs cover what most people need, and nobody has to eat mushrooms to do this well. I won't tell you they're dangerous either, because for most people they aren't.
Who might reasonably try them
Here's what I've seen work. The readers who do fine with a few mushrooms tend to share a few things:
- They're past the first few weeks and eating steadily.
- Their digestion is calm right now.
- They miss the texture of a cooked vegetable, and a small portion settles the craving.
- They're not on a strict elimination plan.
If that sounds like you, here's a gentle way to try it.
- Start small. A couple of cooked mushrooms alongside a steak or eggs, not a big bowl.
- Cook them well. Raw mushrooms are harder for many people to digest. Saute them in butter or tallow until soft.
- Change one thing at a time. Don't add mushrooms the same week you add dairy, a new supplement, or a new medication.
- Watch for a day or two. Notice gas, bloating, loose stools, reflux, or a change in your sleep. A quick note on your phone is enough.
- Keep it easy to undo. If something feels off, stop and go back to your base foods. That's not a setback. It's information.
Your situation might be different, and that's the point of going slowly.
Who should skip them
Skip mushrooms if any of these apply:
- Your doctor or dietitian told you to avoid them. That settles it. Some people have allergies or conditions where mushrooms are a problem, and they know who they are.
- You're on a therapeutic elimination. If you chose beef, salt, and water to calm a flare or find a trigger, adding anything undoes the test. Finish the elimination first, then bring foods back one at a time.
- Your gut is unsettled right now. Get calm first, then experiment.
- You're picking wild mushrooms. Only eat wild mushrooms that an expert has identified. Store-bought is the safe habit.
If you take medications or have been diagnosed with any medical condition, you need individualized medical oversight. Don't make changes without consulting your doctor.
What about fiber?
Readers ask me this a lot. Fiber isn't required on carnivore, and many people find their digestion improves without it. We don't need mushrooms for it, and we don't need to worry if we skip them. If you want to understand why, our post on gut health without fiber goes through it.
Quick answers to the "can I eat X" questions
Dairy. Optional, not required. Many people do well with butter, hard cheese, or heavy cream. Others feel better without it. If your weight loss stalls, a two-week break from dairy is one of the things worth trying, but it isn't the first suspect. Leave it out if it bothers you.
Onions and garlic as seasoning. Strictly speaking, they're plants, so they're outside a strict approach. A pinch in a recipe is not a disaster, and I won't scare you about it. If you're keeping things simple, salt and pepper work beautifully. If you're doing a therapeutic elimination, leave them out for now.
Sweet things. Our answer to a craving for something sweet is protein, fat, salt, and time. Not berries, not dark chocolate, and not sugar-free candy. Swaps tend to keep the craving going.
My honest take
If you're asking this question because you miss vegetables, I'm glad you asked instead of quietly guessing. You aren't doing anything wrong by wondering. Stay in the animal-food lane while you settle in. After that, if mushrooms feel right and your clinician has no concerns, try a small, cooked portion and watch how you feel.
Still unsure what to put on your plate? Our carnivore food list shows what to eat and buy. If you're missing starchy sides, what to eat instead of potatoes and beans is a good next read.
I'm not a doctor. I've researched this deeply and worked with many people, but I'm not your doctor. If you have health conditions, take medications, or need specific guidance, talk to someone who knows your full medical picture. Everything I write is educational based on research and what I've seen work. Your situation might be different.