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Sigma Nutrition Radio

#592: How Much Protein is Actually Healthy? – Eric Helms, PhD & Matt Nagra, ND

Sigma Nutrition Radio

Danny Lennon

Health & Fitness, Nutrition

4.8 • 633 Ratings

🗓️ 27 January 2026

⏱️ 86 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In this episode, the discussion turns to a deceptively simple question that sits at the centre of countless nutrition debates: how much protein do we actually need?

On one side, there are confident claims that very high protein intakes are not just beneficial but essential for maximising strength, performance, and muscle mass. On the other, equally strong assertions that the current RDA is entirely sufficient for most people, and that going beyond it is unnecessary or even harmful.

Dr. Eric Helms and Dr. Matthew Nagra work through what the evidence actually tells us when we step away from slogans and thresholds. What does 0.8 g/kg represent, and just as importantly, what does it not? At what point do higher intakes stop meaningfully improving muscle-related outcomes? And where do concerns about kidney function, longevity, and chronic disease fit when we look at long-term data rather than isolated mechanisms?

Rather than treating protein as a single number to defend or dismiss, this conversation places intake in context: training status, ageing, health outcomes, source and optimising for specific goals.

Timestamps

  • [05:19] Discussion starts
  • [07:18] Setting the scene: protein intake and health
  • [09:38] Health outcomes and protein intake
  • [10:27] Mechanistic measures vs. longitudinal outcomes
  • [15:47] The RDA: purpose and limitations
  • [19:19] Higher protein recommendations: where do they come from?
  • [21:48] Protein intake for athletes and general population
  • [27:25] Dose response and optimal protein intake
  • [44:59] Statistical errors in Morton meta-analysis
  • [46:07] Comparing meta-analyses: Morton, Tagawa, and Nunez
  • [56:23] Mechanistic claims and protein intake
  • [59:49] Nitrogen balance and protein requirements
  • [01:11:55] Protein sources and health outcomes
  • [01:18:13] Summarizing optimal protein intake
  • [01:24:31] Key ideas segment (premium subscribers only)

Related Resources

Transcript

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0:00.0

Hello and welcome to Sigma Nutrition Radio. My name is Danny Lennon. You are listening to Episode 592 of the podcast. We are going to be

0:09.4

taking on a question that might seem simple at first glance, but has a lot of nuance buried within it.

0:16.2

And we're going to be discussing how much protein do we actually need in order to be healthy. And this is really

0:23.2

interesting because it sits at the center of a number of different debates that currently go on

0:27.3

within nutrition. And so hopefully we're going to try and tease through what these debates are,

0:32.7

where some of the claims on either side come from, and then what we can take based on the

0:37.0

current evidence. Because on one side when from, and then what we can take based on the current evidence,

0:38.1

because on one side when it comes to this question, there are many claims you see from people

0:43.9

either coming from maybe a physique or fitness-orientated perspective, or even just has now

0:51.1

become popular online with this huge move towards protein being almost a buzzword

0:56.1

nowadays, where you see very confident claims that very high protein intakes are not just

1:01.6

beneficial for our health, but actually are essential for things like maximizing strength

1:06.5

or performance and muscle mass, and therefore having also health benefits as well.

1:11.9

On the other side, then, when we look towards the lower end, let's say, we have equally

1:18.2

strong assertions that the current RDA for protein, which is currently 0.8 grams per kilogram,

1:25.3

is entirely sufficient for most people. But even beyond that, we will hear

1:29.7

the claim that going beyond that level is unnecessary, or even some will make the claim that it's

1:36.8

very harmful for a few different reasons and different mechanisms that proposed. And of course,

1:42.0

there is a whole range of nuance within each of these arguments,

1:45.5

and there's not one particular argument that everyone makes. And so we're going to have to try

1:49.9

and tease those apart. And so to do that, I have bought back on two previous guests of the

1:56.6

podcast, Dr. Matthew Nagra and Dr. Eric Helms, and they are going to help me walk through

...

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