Carnivore Diet: Is It Healthier To Eat Only Meat and No Plants?

The Carnivore Diet: My 30-Day Experiment with a zero plant diet.

**WARNING** If you’re not comfortable challenging what you think you know about diet, nutrition, and health, stop reading now. If you’re comfortable exploring new thoughts and possibilities, enjoy.

For 30 days I’ll eat nothing but meat and water. No plant matter whatsoever. Except for tea &/or coffee.

Before you start throwing questions at me, please read this entire post. I will present my rationale for putting myself through this, along with details of my setup (how much food, when, what meats, etc), and the questions I have about the health and sustainability of this approach. I also created this Carnivore Diet FAQ post to address questions not answered on this post.

Why Follow The Carnivore Diet?

Call it scientific curiousity.

When I first heard of this new zero-carb, meat and water only craze, I was dismissive.

My first was probably exactly like yours: “it’s crazy”.

How can a diet devoid of plant matter and the fiber, micronutrients, and beneficial pant compounds they contain, actually be healthier for humans?

I had to know more.

I started following the man leading the Carnivore Diet charge on Twitter, an Orthopedic Surgeon and World Record-holding masters athlete (rowing), Shawn Baker. 

He was addressing all of the questions I had in my head: (keep reading, I’ll address these below)

What about plants?

What about fiber?

What about our gut microbiome?

What about micronutrients?

And he wasn’t the usual social media savvy, fad-diet evangelist. He actually created a website to accumulate more data on the Carnivore, aptly named and recruited hundreds of volunteers to try the diet, test it, and prove his hypothesis wrong.

The goal is to challenge everything and turn anecdotes into real data.

That’s what I think draws me to this diet the most. Everyone WANTS TO POKE HOLES IN IT, but so far, the folks who follow the Carnivore Diet are not-only surviving, they seem to be thriving. And they have some compelling science to support their claims…

I’ve also scheduled an interview with Shawn and my friend Mike T. Nelson, Mr. metabolic flexibility for an upcoming episode of the OPP. We’ll dive as deep as possible and cover all the science, objections, and actual lab data from the participants in the 90-day, n = many experiment. (That episode of the Optimal Performance Podcast should air around Christmas 2017)

If these carnivores are right, this could change what we THINK we know about diet, nutrition, and health.

I’m fascinated and intrigued. I want to know. And the best way to know, is to experience. So in the name of investigative journalism and scientific discovery, I’m embarking on the Carnivore Diet for 30 days.

I’m OK challenging what I think I know in order order to pursue the truth. Am I’m also OK with finding out that a 30-day experiment was NOT the healthiest way to eat. At least I’ll have scietific data that proves a) this is not the optimal way for me and b) we do in fact need the plant matter we thought we needed.

But first, some Carnivore Diet basics.


What exactly is the Carnivore Diet?

The Carnivore Diet, like Fight Club, has a short list of rules. As far as I can tell, the main rule is this: meat and water only. No plant matter.

Unlike Fight Club, mum is not the word. Everyone is talking about it – especially on Twitter – and it’s quite entertaining. Even INC Magazine has covered the trending topic.

For scientific validity, I will avoid ALL plant products (other than coffee, tea, and cooking herbs/spices).

As for how much to eat, Dr. Baker says the meat-only approach helps us regulate hunger and normalize appetite. If you’re hungry, eat a steak. If you’re not hungry, don’t eat.

The template I’m following is 2 x 16 oz ribeye steaks per day. This is what I’ve seen to be the most common approach among male carnivores who lift weights and are about my size.

I’m not a huge fan of ribeye, so I calculated the macros to get the approximate ratio of protein:fat (About 1.4 grams of protein for every 1 gram of fat)

According to US Wellness Meats, the nutrition information for a ribeye steak looks like this:

155/109 = 1.42 (ish)

Having this information, allows me to get the equivalent daily macros from other sources. Here’s my personal food list:

  • Liverwurst from US Wellness Meats
  • Bone Broth
  • Personally harvested, local, wild Venison
  • Pasture-Raised Lamb
  • 100% Grass-Fed Ground Beef
  • Sausage & Bacon (sugar-free from US Wellness Meats)
  • Bone Marrow
  • Ground Turkey

If I eat a leaner cut of meat, I’ll increase my fat intake with bone marrow or bone broth.

I’ve also combined fattier cuts of meat (lamb) with leaner cuts (turkey or venison) to make a mixed burger or meat loaf that is pretty close to the 1.4:1 ratio.

I’ve always gravitated toward an Intermittent Fasting setup, so I will continue this. My eating window will be about 5 hours, from 11am – 4pm. This will give me a daily fast of about 18-20 hours, depending on the day and exact meal times.

Sample Day:

I’m on Day 6 as I write this and I’m only averaging about 200g Protein and about 150g Fat per day. At an average of 2,150 calories per day (so far), this is actually quite a low calorie plan. I’ll be upping my intake over the subsequent days and weeks.

A Note on Food Quality

I believe the quality of our food is of the utmost important. While many Carnivore Dieters are eating any quality of meat, I will continue to eat only organic, grass-fed, top-quality meat.

Since 100% of my nutrition (including a large amount of fat intake) will come from these animals, I want to ensure that I:

  • Avoid chemical, toxins, pesticides, etc that are stored in the fat tissue
  • Get as many high quality fats like CLA and omega-3’s that are found in higher concentrations in pasture-raised animals
  • Consume meat from an animal that lived a life as close to nature as possible

Concerns/Areas of Interest

Gut Health

Admittedly, this (along with micronutrients) is my main area of concern.

I’ll also be testing at the end, via a stool test for my microbiome and a urine test for intestinal permeability (aka, Leaky Gut). Christine Rosche, a previous guest on the OPP, has done my “before” testing and will provide the 3rd party “after” testing.

I will be watching this very carefully.

I’m paying close attention to digestion, and regularity. In case you’re wondering, (I was) converted carnivores claim to have improved digestion and satisfactory regularity and consistency with bowel movements.

I’ll also be including bone broth several times a week. I’ll use this as a higher fat supplement on the days I eat leaner cuts of meat (venison, turkey, etc) and because it is full of glutamine, glycine, and proline, known to promote gut health. 

It also contains minerals, collagen protein and other joint friendly micronutrients like glucosamine, chondrotin and hyaluronic acid.

Digestion, Bowel Movements, and Gas

Let’s face it, this diet is ultra low in fiber. And my announcement of this experiment was met with more than one “bring on the protein farts”.

Carnivore converts claim zero bloat (usually caused by vegetables and fiber), zero discomfort, and regularity with regard to bowel movements. They’ve ever shared with me this fascinating study that shows a zero-fiber diet to be the only diet that eliminated bloat, constipation, and straining…

Using that study is a bit of data-cherry-picking. If you read the study, the zero fiber portion lasted 2 weeks, then subjects were allowed to “find” their own level of “comfortable” fiber intake.

One week in, I can report that bloat and distention post-meal is non-existent. I cannot however, corroborate the reports of beautiful bowel movements.

Prior to this experiment, my gut biome was dialed in, as were my BM’s. Sorry, if that’s too much detail, but hey, it’s part of the conversation. 

Is this just me? It is n=1 is my case, and it may change as my body acclimates. It’s also worth noting again, I spent week 1 traveling which can often disrupt regularity.

Do We Really Need Plants In Our Diet?

The automatic response from most is a resounding YES, but the Carnivore Diet challenges this long-held belief head-on.

The carnivore contingent’s argument begins with the belief that our upright anatomy requires a smaller gut, but we’re also afforded a larger brain.

Scientific American and Harvard have both published reports in agreement with this argument – essentially stating that we traded quadruped, cud-chewing life for the ability to walk upright and think at higher levels.

A second pice of evidence in the Carnivore’s favor is the science presented in the best-selling book, The Plant Paradox. In this book, Dr. Steven Gundry explains how plants have defense systems to prevent predators (humans included) from eating them.

These defense systems include lectins, gluten and other plant compounds that disrupt human digestive systems and lead to chronically inflamed states and auto-immune disorders like Crohn’s, IBS, Leaky Gut, and others.

This post is already long enough, so I’ll cut this short. Check out the book if you want more info on which plant we should eat less of.

Finally, speaking of plants we thought were healthy, another Carnivore convert at Keto Kulture has pointed out that our favorite “healthy” plants, cough KALE cough, may not be as naturally occurring as we thought.

As it turns out, kale, kohlrabi, cauliflower, broccoli, cabbage and Brussel Sprouts all come from man’s interaction with nature to cultivate specific strains from the wild mustard plant.

I’m not saying this makes them bad – just that this information is a revelation to most people who would have previously thought that these vegetable were naturally occurring. 

TO ME, none of these are definitive evidence (yet) to write off vegetables completely. But collectively, this evidence is compelling enough for me to experiment with this diet for 30 days.

Micronutrients, Vitamins, etc

One of my first questions was – what about the flavonols and polyphenols in plants? You know, the powerful compounds that make spinach, blueberries, chocolate and other superfoods so “healthy”.

Some are saying, we may not need them. I’m not sold on this, but I am comfortable challenging this belief.

Remember our friend at Keto Kulture who exposed man’s cultivation of our favorite vegetables?

Here’s his take on the vitamin and minerals issue:

“Remember the FDA’s brilliant food pyramid? The monolith of health built on a foundation of processed carbs. We were confident enough to teach that in schools. We were wrong.” 

He continues, “The FDA has also published RDI (recommended daily intake) of nutrients. […] Here’s the thing…those RDI guidelines were designed for a population which eats a high-carb Standard American Diet. Which is basically garbage.

Carnivores are running an entirely different metabolism than Joe Blow, bread eater. To say a carnivore is nutrient deficient, based on the FDA’s RDI requirements is like saying a Tesla Model-S is missing spark plugs.”

Again, I’m not sure we’re ready to scientifically validate this theory…but this is precisely WHY and WHAT the n = many experiment is TRYING TO POKE HOLES IN.

Something I read a while back in Go Wild got me thinking…

If we eat the right meats (free-ranging ungulates), we may actually be able to outsource the bioaccumulation of these vital nutrients.

Consider this quote from Harvard Psychiatrist John Ratey’s best-selling book Go Wild: “Our primary method to overcome our inability to digest [plants] is to outsource the job.”

To whom do we outsource? Animals.

Check out the entire passage from Go Wild below. I found the book a delight and highly recommend it. 

As for the debate over the health-promoting compounds in berries, avocados, and chocolate…I don’t have an answer (yet) and this is currently the leading reason I will likely return to an omnivorous diet at the completion of my 30-day experiment.

Recommended Reading:

Go Wild by John J. Ratey

The Plant Paradox by Dr. Steven Gundry

Experiences & Observations

Update After Week 1:

Weight is down. Significantly.

I’m always between 187-189. After 6 days, I was at 183.5.

As noted above, total calorie intake is pretty low. I’ll be making a conscious effort to increase total calories this week.

Energy Levels

Just as all carnivores report, my energy levels have been high and steady. I have zero energy or mood swings. Mental clarity has been great as well.

Day 4, however was the exception to these statements. The proverbial “carnivore flu” hit on that day. I felt like I had been hit by truck, physical energy was super low and emotional resiliency was low as well. In fairness, that day was also our 3rd hotel in 5 days during a road trip that featured my wife suffering from a cold, and food poisoning (not related to the carnivore diet).


Protein and fat are known to be satiating, so it should be no surprise that the carnivore satisfies one’s appetite.

After meals – despite them being 1-1.5 pounds of meat – I feel light, “bouncy”, clear and energized.


Most of the time, I’m not hungry. By most of the time, I mean all of the time.

When I do eat, however, I become hungry and enjoy eating. So it’s not like I’m force-feeding myself.