In this episode, we sit down again with veterinary epidemiologist and Fatty15 co-founder Dr. Stephanie Venn-Watson to explore the emerging science behind C15:0, an odd-chain saturated fatty acid increasingly recognized as potentially essential for human health. The conversation begins by addressing skepticism and online claims that C15:0 research is a "scam," before diving into the human and epidemiological evidence showing that higher circulating levels of C15:0 are associated with lower cardiometabolic disease risk. Dr. Venn-Watson explains why not all saturated fats behave the same biologically, contrasting C15:0 with C16 and highlighting C15:0's unique properties including anti-inflammatory effects, mitochondrial support, and protection against cellular stress. Together they explore how modern dietary patterns may have reduced natural intake of this nutrient, what the latest clinical and mechanistic research suggests about aging and metabolic health, and why continuing to challenge long-standing nutrition dogma requires following the data wherever it leads.

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00:00 – The "C15 Essential Fatty Acid Scam" Debate

02:08 – Why Critics Say There Isn't Enough Human Evidence

06:35 – Dolphin Research That Led to the Discovery of C15

11:15 – Epidemiology: Higher C15 and Lower Cardiometabolic Risk

16:05 – Saturated Fat: Why the Narrative May Be Oversimplified

21:30 – C15 vs C16: Not All Saturated Fats Are the Same

27:05 – What Makes a Fat Truly "Essential"

32:10 – The "Goldilocks Fat": Why C15 Stands Out

38:20 – Anti-Inflammatory vs Pro-Inflammatory Fats

44:40 – Mitochondria, Cellular Stability, and Longevity

51:15 – Ferroptosis and Protecting Cells From Oxidative Damage

57:50 – Are We Aging Faster Without Enough C15?

1:05:10 – Why Modern Diets May Be Lower in C15

1:12:30 – How Scientists Follow the Data, Even Against Dogma

1:21:50 – What "Ever Forward" Means in Science and Life

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Episode resources:

Stephanie's first appearance on the show in episode 832
Save 15% with code EVERFORWARD at https://www.Fatty15.com/everforward