The Truth about Saturated Fat, Omega-3 Fatty Acids and Total Mortality | Dr. Tom Brenna
The Dr. Gabrielle Lyon Show
Dr. Gabrielle Lyon
4.5 • 1.2K Ratings
🗓️ 7 April 2026
⏱️ 92 minutes
🧾️ Download transcript
Summary
Only nine scientists were asked to advise on the 2025 Dietary Guidelines for Americans, and Dr. Tom Brenna was one of them. In this conversation, he pulls back the curtain on how dietary guidelines are actually made, why the process has never been the same twice, and what it was like to watch a decades-old saturated fat recommendation get carried forward despite a lack of evidence supporting it at the level of total mortality. This is the dietary guidelines conversation the internet has been missing: straight from someone who was actually in the room.
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References:
https://ajcn.nutrition.org/article/S0002-9165(24)00527-6/fulltext
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⏰Timestamps:
00:00 Intro of Show
00:14 Dr. Tom Brenna’s Background
05:19 Working with IBM
08:46 Family Life
10:38 2015 vs. 2025 Dietary Guidelines for Americans
28:06 American Society for Nutrition: Behind-the-Scenes of Dietary Guidelines
32:10 History of Saturated Fat
42:17 Different Types of Fat
45:23 How Are People Eating during World War II
51:09 The Whole Milk for Healthy Kids Act of 2025
53:58 What is Saturated Fat?
57:57 Link between Saturated Fat and Cardiovascular Diseases
1:05:53 Saturated Fat vs. Total Mortality
1:13:13 Best Studies on Saturated Fat
1:14:42 Reduction of Saturated Fat = Lowered LDL Cholesterol
1:22:35 Pregnancy and Fish Consumption Myths
1:37:55 Recommended Nutrition
1:39:59 Different Types of Oil and Effects on Health
1:42:04 Omega 3’s and 6’s Recommendation
1:50:02 Omega 3 Fatty Acids and ADHD
1:50:54 What’s Next: Precision Nutrition and Genetics
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Transcript
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| 0:00.0 | If you start substituting high omega-6 oils for your dairy fat, that's when things really go off the rails. |
| 0:07.0 | When you feed those oils to pregnant animals, you can look in the brains of the offspring and they are screwed up. |
| 0:16.0 | I mean, I've never heard that as a technical term. |
| 0:21.6 | Is it a mistake for pregnant women to avoid fish? |
| 0:25.6 | Absolutely a mistake. No doubt. |
| 0:27.6 | 100%. |
| 0:28.6 | People that eat the most fish in the world do not have kids who are mentally challenged. |
| 0:34.6 | They just don't. |
| 0:35.6 | I always invoke iodine deficiency. You see nothing |
| 0:39.2 | like that, the kids just get smarter. Is pregnancy that one time to build the brain versus |
| 0:45.3 | post-pregnancy into childhood? Breastfeeding is so important. Kids are getting omega-3, they're |
| 0:53.0 | getting DHA in breast milk. We are not just |
| 0:56.4 | the heart. We have lots of other organs, the most important of which, in my opinion, is the brain. |
| 1:02.7 | Omega-3 fatty acids, DHA are necessary, amazing for brain development, important for pregnant |
| 1:10.2 | women. Is there something else also on the horizon? |
| 1:12.6 | You're thinking this hasn't been developed enough and it's going to come out. |
| 1:17.6 | The story of precision nutrition is an under told story. |
| 1:21.6 | It is one that... Most people assume nutrition advice is cautious for reason, that if something is warned against, it must be dangerous. |
| 1:42.4 | But what if the opposite was true? |
| 1:43.7 | What if one of the biggest nutrition warnings of the last few decades didn't protect people |
| 1:49.6 | at all? |
| 1:50.6 | But quietly removed something the developing brain depends on. |
... |
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