Peter Attia MD#162 - Sarah Hallberg, D.O., M.S.: Treating metabolic disease, & a personal journey through cancer
At a glance
WHAT IT’S REALLY ABOUT
Sarah Hallberg on Carb Restriction, Palmitoleic Acid Biomarkers, and Stage Four Lung Cancer
- Sarah Hallberg explains how she moved from prescribing low-fat, low-calorie diets to carbohydrate restriction after seeing patients' type 2 diabetes resolve and insulin doses fall dramatically.
- She and Peter Attia argue that prediabetes and metabolic syndrome are widespread, that damage begins well before A1C or fasting glucose become abnormal, and that standard cutoffs can miss people, including African American patients with normal triglycerides.
- Using feeding studies, Hallberg shows that eating more saturated fat on a low-carb diet did not raise blood saturated fat, while palmitoleic acid (16:1) rose with higher carbohydrate intake, suggesting it could mark an individual's carbohydrate tolerance.
- Hallberg tells of her June 2017 collapse and diagnosis of stage four EGFR-mutated lung cancer despite never smoking, her aggressive rotating treatments, and a life-threatening reaction to Gemzar.
- Her experience as a privileged physician-patient who still faced a four-month delay before a clinical trial drives her commitment to health equity across diabetes and cancer care.
IDEAS WORTH REMEMBERING
5 ideasNormal blood sugar does not mean metabolic health.
Hallberg and Attia stress that insulin resistance develops for years before A1C or fasting glucose become abnormal, and Hallberg cites NHANES data showing 88% of American adults are not in optimal metabolic health.
Dietary saturated fat does not simply show up as blood saturated fat.
In the feeding studies Hallberg presents, people eating very high saturated fat on low-carb diets did not have higher serum saturated fatty acids, and if anything levels trended higher on the lower-saturated-fat, higher-carb diets.
Palmitoleic acid could serve as an early, individualized marker.
Hallberg says 16:1 rises when carbohydrate intake exceeds a person's tolerance via increased SCD-1 activity, and could eventually help identify an individual's carbohydrate threshold before conventional markers change.
Obesity may be a result of metabolic disease rather than its cause.
Hallberg and Attia both argue the liver's conversion and export of fat happens before major weight gain, and Hallberg says this means patients with obesity should not be blamed or treated with bias.
Reducing insulin dose is a meaningful win even if insulin isn't eliminated.
Attia notes that going from 100 units to 20 units is a major health improvement, and Hallberg explains that whether someone can come off insulin depends largely on their remaining beta cell function.
WORDS WORTH SAVING
5 quotesI just need 11 years, which to everyone was unrealistic.
— Sarah Hallberg
You can live feeling sorry for yourself and of all the things that you're gonna lose, or you can go out and live, and your kids are gonna be better for it.
— Sarah Hallberg
Damn it, I liked my old life, and I liked the old me, and it's still a little hard to get used to who this person is now.
— Sarah Hallberg
88% of adult Americans are not in optimal metabolic health.
— Sarah Hallberg
The future of medicine has to be coming up with tools that allow us to take broad, sweeping, you know, population-based insights and very quickly, uh, target individuals.
— Peter Attia
High quality AI-generated summary created from speaker-labeled transcript.
