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Marty Kendall on Protein Confusion, Flawed Rodent Research, Nutrient Density, Satiety, and Insulin

Updated: Apr 14, 2021

Mary Ruddick, CNC - Peak Human Podcast


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We’re back with Marty Kendall, my nutrient density brother from another mother! I’ve been following his work since we recorded our first episode 2.5 years ago and he’s always doing something interesting and informative.

We cover a very interesting “scandal” in the rodent nutrition study world. I won’t spoil the details but it really is a shame these researchers took out this certain data, because all the other work they’ve done is spot-on.

We also hit all my other favorite topics in this one like nutrient density, satiety, insulin, personal fat threshold, the nutrient leverage hypothesis, and a whole lot more.

Marty Kendall is an engineer who seeks to optimise nutrition using a data-driven approach.

Marty’s interest in nutrition began eighteen years ago to help his wife Monica better control her Type 1 Diabetes.

Since then, he has developed a systematised approach to nutrition tailored for a wide range of goals, contexts and preferences.

Over the past five years, Marty shared his research at

He has developed Nutrient Optimiser and Data-Driven Fasting to guide thousands of people on their journey towards nutritional optimisation.

Please support and click through to the Indiegogo campaign there. We already are ov of our campaign goal through all the generous contributions to the cause. 100% of the money is going to purchase animals for the school children.

Mary and I had a great Zoom call with one of our big contributors who put almost his whole covid relief check in. He said he didn’t ask for it, didn't need it, and would rather see it go much further to help the communities in need. Check out what we’re doing at

Also support the show and my team by checking out what we’re doing at

We have boxes of grass fed and finished beef, buffalo, and lamb that’s shipped out to the 48 US states. We also have the low Omega 6 PUFA pork and chicken. Our other specialty is the ground beef with organs mixed in - it’s extra special because it has the liver, heart, kidney, and spleen. Most people stop at the liver and heart.

Our skin food is back in stock. It almost sold out immediately when we got our new batch. It’s that good, I’m telling you. It’s really a great deal as well because a little goes a long way. I still have barely dented my jar. It’s made from regeneratively grown beef tallow and is all hand made. You can add on our freshly ground seasonings and biltong as well. Biltong is a south frican traditional beef snack with no sugar, nitrates, or other wacky stuff. It really saved me on the long flights to and from Africa - I don’t think I’d have made it without my Nose to Tail biltong.

So thanks for sharing this show with a friend, giving it a review on your podcast app, and being part of the Sapien community! For everything Sapien including being part of the tribe go to

And now please enjoy this episode with Mary Ruddick.

Also check out our new beef tallow body care products

Biltong (South African air-dried beef specialty)

and custom patch hats

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  • [5:40] His background and how he got into the nutrition world.

  • [9:50] The Protein Leverage Hypothesis and obesity.

  • [17:25] The Mice Study and protein consumption.

  • [31:20] Satiety and nutrient density.

  • [48:30] Why a low protein diet is definitely something you don't want to implement.

  • [55:40] The importance of avoiding eating carbs and fats together.

  • [59:00] How you can still lose fat on a high carb diet.

  • [1:07:20] How insulin affects your body fat levels.

  • [1:11:00] Personal fat threshold and how insulin plays a role.

  • [1:14:10] Why obese people are still hungry while they have so much stored energy in their body.

  • [1:19:00] Antinutrients and autoimmune issues.

  • [1:25:00] Wrap up and what he has in the works.

[Extended show notes are available to Patreon supporters and members of the Sapien Tribe]


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Craig Castanet
Craig Castanet
Jun 07, 2021

Brian, it seems you didn't challenge his data on nutrient density. It was my understanding that organ meats and shellfish were the most nutrient dense.

Craig Castanet
Craig Castanet
Jun 07, 2021
Replying to

Well, I looked at his chart of nutrient density, and it was quite at variance from my other sources. I'm somewhat confused because at minute 1:28 I see his nutrient density/satiety chart, and it is clear that several plants were at the top of the chart, ahead of lobster, for example.

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