Carnivore Diet: 30 Day Review

Re-published from my archives, here’s the review I wrote of my first 30 days on a carnivore diet.

Carnivore Diet: 30 Day Review

Here’s a throwback from the archives

Introduction:

Background: I have done a paleo / primal diet for about 8 years (plus / minus some experimentation) and in 2019 added ketogenic macro ratios (70/20/10) on top of that as I re-entered combat sports (boxing / bjj). I the keto-sphere I had a lot of success initially, but over the year had some ups and downs with weight and eventually devolved to shakes, bars, and fat bombs and could tell something was off. So, I decided to give carnivore a shot, test and measure some things, and see what happens.

Protocol: Eat 70% natural / grass fed beef or pork, 10% fish, 10% organs, and 10% eggs (approximately). Drink only water or bone broth (no alcohol, no caffeine, no tea). I also excluded sweeteners (natural and artificial) and all dairy (initially). I did allow herbs and spices (see summary below).

Data: If you want to look at the raw data, plus links to reference web articles and podcasts, see the public spreadsheet on Google Drive. I also have an album on Google Photos that has my blood work, grocery lists, and screenshots of weekly macro/micro nutrient reports (from Cronometer). The grocery lists are approximate and don’t necessarily reflect that specific week’s grocery cost as sometimes I stocked up on sale items that I didn’t eat that week. The baseline data for comparison was based on the average of all samples I had from 2019 where I was eating a (mostly) paleo keto diet (noted as PKO below). This data is compared against the average of (usually weekly) samples taken from my first 30 days as a carnivore (noted as CRN below).

Results:

Biometrics:

Mean Arterial Pressure (MAP):

I like to use MAP because it’s easier than comparing variance in both systolic and diastolic blood pressure. There was a minimal increase of two points. The CRN low was 99.33. I work a highly stressful job in mental health, so any given week (or day) could easily bump my MAP a few points.

Resting Heart Rate (RHR):

With RHR I often use the metaphor of my (typically) high blood pressure and low pulse represented by a diesel truck. In contrast you may have low pressure and a high pulse represented by a redlining sports car. In the comparison above my RHR remained virtually identical.

Ketones (Urine):

I don’t obsess over my ketone production, but I was curious what the result would be. As I expected, my urine ketone production dropped by about 60%. Looking at my macronutrients this isn’t surprising.
PKO: 70% fat, 20% protein, 10% carbs (3,175 calories / day)
CRN: 58% fat, 41% protein, 1% carbs (2,219 calories / day)

Nutrient Density and Cost:

This is something I was very interested in and, like a lot of carnivore critics, I expected to tank. Vegetables are good for you and you NEED them, right?

PKO: 85% Nutrient Targets
CRN: 70.25% Nutrient Targets

There’s a 17% decrease, but I’d be willing to bet that most people on a Standard American Diet aren’t hitting 70% of nutrient recommendations. Not to mention, that there is a lot of speculation that low carb diets throw those recommendations out of whack (e.g. sodium, fiber, Vitamin C, O6:O3 ratio, etc…).

Next, “eating meat is expensive” right? My PKO average weekly cost (including supplements and eating out or a cheat meal about once / week) was $84.96. My CRN average cost over 5 weeks (without eating out or any supplements) was $67.47. That’s 20% less! Let’s go further still though. When did I get the most “bang for my buck”, that is, nutrients per dollar (cost / (calories*nutrient density)).

PKO: (84.96 / (3175*0.85) = $0.0325 / nutrient%
CRN: (70.25 / (2219*0.7025) = $0.0451 / nutrient%

Recovery and Electrolytes:

As an athlete this is very important to me. Performance concerns may even trump my health concerns in some situations. You can only improve as fast as you can recover, so let’s take a look.
On average, my electrolyte consumption looked like this over 4 weeks:

Na — 122.75% RDA (custom RDA of 5,000 mg)

There is one stand out though, Week 3:

Ca — 82% (50% better than average)
Mg — 49% (68% better than average)
K — 83% (83% better than average)
Na — 136% (10% better than average)

This particular week I ate the same amounts of fish (canned mackerel) and eggs. The big difference though was that I ate almost exclusively beef! Flank steak and chuck roast had been on sale.
Another recovery measure I use is a simple 1–5 scale of how good (or bad) I feel; meaning soreness, fatigue, and sleep quality.

PKO: 3.1 soreness, 3.4 fatigue, 3.5 sleep quality
CRN: 3.96 soreness, 4.29 fatigue, 4.25 sleep quality

I have done an experiment before and found sodium to be largely important in reducing fatigue and improving sleep quality. The sharply increased protein intake on CRN could also explain the improved soreness and fatigue scores. I actually think my caffeine protocol had more to do with the sleep improvement (see below).

Omega 6 : Omega 3 Ratio:

I did not track this throughout the entire experiment, but only looked into it recently. Ancestral tribes had close to a 1:1 ratio, but Western cultures have upwards of 15:1. 10:1 is considered high risk, but inflammation starts at 3:1, increased mortality at 4:1, and multiple cancers at 5:1. At Week 4 I’m sitting pretty at 2:1 (4g : 1.8g).

PKO: 166 lbs. (average)
CRN: 161 lbs. (average)

Bodyweight decreased by 4%. I was already pretty lean (easily single digit body fat), but as I mentioned in the introduction there was a lot of variance with PKO. Week 4 on CRN was an outlier (165 lbs). I’ll have to rely on follow up data, but I also had cold / allergy / sinus thing going on this week and (thanks to CRN I believe) felt super bloated with the additives, corn syrup, and alcohol and other junk in cold / allergy medicine. More on weight variance in the summary below.
From past meal plans and training logs I tend to bottom out at my leanest (around 160 lbs) when my (daily calories / weekly training yours) = ~300.

PKO: 3175 / 6.7 = 473.88 (average 166 lbs.)
CRN: 2219 / 6.75 = 328 (average 161 lbs.)

Summary:

Miscellaneous Observations:

  • Bowel Movements: Early on I missed several days, but normalized to about 1 / day after the first week.
  • Simplicity: Is thing of beauty. Shopping, cooking, it’s all easier. I stop by the grocery store 2–3x / week just to see if meat is on sale and buy up whatever they have and throw it in the freezer until I need it. Then, simply drop a few pounds of organs in the slow cooker for a “single day feed”, or cook a couple roasts or chickens in the oven all at once.
  • Cravings: As soon as Week 1 I had zero cravings for anything sweet. Honestly, truly. I think that leaving out any kind of sweetener (natural or artificial) was largely beneficial in this process. While I tried to kick sugar free gum as well, I was only able to keep it to about one pack per week (I only chew it at work).
  • Water: I did notice that I was drinking a lot more water, sometimes double at meal times. I would guess this is due to my gut flora adjusting and needing more fluid to create a bowel movement.
  • Eating Out: Eating out (and alcohol) are basically never worth it, at least by yourself. Social affairs are a different situation, but eating out is expensive and not necessarily more convenient when every grocery story has pre-boiled eggs.
  • Caffeine: I wasn’t able to totally kick coffee. For the first couple weeks I kept it to one “social” cup of coffee on the weekends, but then included it in my reintroduction process which I’ll be following up on (see below). Personally I love coffee, it’s delicious. What I don’t want to do is be dependent on it (to wake up or otherwise function). I’m certainly not opposed to it as a “recreational drug” nor as a performance supplement (barring any recovery inhibition as that would be counterproductive).
  • Performance: I did not notice any significant change in sport performance on CRN vs PKO.

Overall Summary:

Technical details aside, I didn’t notice a huge difference on CRN vs. PKO. It is a little cheaper in cost, but a little more expensive per nutrient density. It is also much more convenient and simpler overall (i.e. drop a roast in the oven versus “can I have this shake or bar?”) Simplicity definitely matters if your going to try and sustain something long term. That alone might keep me a carnivore for quite some time.

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