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Sigma Nutrition Radio

#599: Does Unprocessed Red Meat Increase Diabetes Risk? – Gil Carvalho, PhD MD & Mario Kratz, PhD

Sigma Nutrition Radio

Danny Lennon

Health & Fitness, Nutrition

4.8 • 633 Ratings

🗓️ 24 March 2026

⏱️ 79 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

This episode examines whether unprocessed red meat has a causal role in (1) type 2 diabetes risk and intermediate measures of glucose intolerance (insulin resistance, beta cell dysfunction, glycemic markers) and (2) cardiovascular disease (CVD) risk.

While there is commonly observed risk signal from observational cohorts, there exist short-term randomized controlled trials (RCTs) that show largely null effects on glucose homeostasis. This had led to differing opinions and interpretations of the evidence base.

Some feel that in the context of an otherwise healthy diet, there isn't much to suggest concern about consuming unprocessed red meat. While others are of the view that there does exist a risk and that limiting or even avoiding consumption is prudent.

The crucial concept of replacement effects is discussed. Increasing red meat intake always means decreasing something else or increasing total energy intake. Therefore, interpreting evidence requires specifying the comparator food(s), the background dietary pattern, the dose, the cut (lean vs fatty), and how the meat is prepared.

To discuss their interpretations of this contentious evidence base, Dr. Mario Kratz and Dr. Gil Carvalho join the podcast to go through the studies most directly related to these questions.

Timestamps

  • [06:20] Red meat's impact is debated
  • [10:54] Mechanisms linking meat to diabetes
  • [15:31] Cohort evidence on diabetes risk
  • [24:43] Differences between cohorts and threshold effects
  • [33:13] RCT evidence and substitution trials
  • [45:49] Why comparator foods matter
  • [50:43] RCT examples and mixed results
  • [01:00:30] Is there cardiovascular risk beyond saturated fat?
  • [01:08:10] Epidemiology patterns and dose thresholds
  • [01:11:36] Personal recommendations and risk tolerance
  • [01:16:19] Key ideas

Related Resources

Transcript

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0:00.0

Hello and welcome to Sigma Nutrition Radio. This is episode 599 of the podcast. My name is Danny

0:07.6

Lennon. You are very welcome to the show. Today we're going to be tackling quite a complicated,

0:13.2

but very interesting question in the field of nutrition science, looking at a exposure that can

0:19.4

be quite tricky to get some clear evidence on for some reasons

0:22.9

I'll explain in the moment and trying to discuss the current evidence we have with two of the

0:28.7

people I think do a really good job of reading and interpreting studies and coming to some

0:34.3

fair conclusions. We're going to be talking about the exposure of unprocessed red meat.

0:41.0

And in particular, we're going to be looking at two main areas of outcomes.

0:47.4

One that relate to diabetes risk.

0:49.9

So that could include anything from insulin resistance, glucose tolerance, or actual diabetes onset.

0:56.0

And then we'll be looking at some of the cardiovascular outcomes, so particularly development of

1:02.0

cardiovascular disease. What we're not going to be looking at is any of the other outcomes.

1:06.7

And of course, there are many that we could look at. Most notably cancer. And I think there's a few reasons that we'll maybe discuss.

1:13.5

One, that there's maybe a bit more clear evidence in that area.

1:17.1

Second, you'll note the exposure we're talking about is specifically unprocessed red meat

1:21.3

as opposed to processed meat.

1:23.7

I think the evidence is much clearer in relation to processed meat. And the increases in risk we see with a variety of meat. I think the evidence is much clearer in relation to processed meat and the increases in risk

1:29.8

we see with a variety of chronic diseases. And so we've covered that on some other episodes

1:35.2

with as much more debate within nutrition science and just more broadly of people worrying

1:40.0

about health effects relates to unprocessed meat. Now, like I said, there's a lot of different

1:44.9

outcomes we could look at. In another episode, we're going to look specifically at some of the

1:49.5

cancer outcomes because that's a whole field of evidence that needs to be looked at in and of

...

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