Dr. Robin Berzin is a Columbia-trained functional medicine physician and the founder and CEO of Parsley Health, where she's seen 80% of patients improve or resolve their chronic conditions within their first year of care. In this conversation, she explains why "normal" lab ranges aren't optimal, how your gut quietly drives everything from brain fog to acne, and the longevity metrics that actually matter for living your fullest, longest life.

In this episode, we discuss:

(03:48) Why "Normal" Blood Ranges Aren't Optimal
(06:43) What Standard Blood Work Misses When You Still Feel Off
(08:13) The Tests To Run When You Feel Bad But Your Labs Look Fine
(12:14) What's Actually Happening In Your Body When You're Burnt Out
(17:08) Building A Better Relationship With Cortisol
(17:57) Why You Shouldn't Eat Carbs First Thing In The Morning
(22:26) Which Popular Tests Are Useless And Which Actually Matter (APOB)
(24:35) The AMH Fertility Test Myth Every Woman Should Know
(30:27) The Symptoms People Misdiagnose That Actually Start In The Gut
(33:16) The Key Levers For Better Gut Health
(36:54) Why Protein At Your First Meal Changes Everything
(40:51) The Longevity Metrics That Matter: VO2 Max And Sleep Consistency
(45:35) Why Low Muscle Mass Is One Of The Biggest Hidden Killers
(57:00) Why Women Were Excluded From Health Research Until 1993
(1:02:19) The Fertility Crisis: Microplastics, Toxins, And Sperm Counts

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I’ve Treated 50,000+ Patients... You’re 63x More Likely To Die From Low Muscle Mass