The Must-Know Biomarkers for Whole-Person Health, According to Dr. Robin Berzin

WHOOP Advanced Labs brings together clinician-reviewed biomarkers and 100,000+ daily WHOOP data points to help members understand how their lifestyle shapes their long-term health. To explore which biomarkers matter most for metabolic, hormonal, and whole-person health, we spoke with Dr. Robin Berzin, member of the WHOOP Medical Advisory Board and Founder and CEO of Parsley Health.

Longevity is About the Next Decade, Not Age 120

When people talk about longevity today, the conversation often focuses on extreme lifespan. But for Dr. Berzin, the real goal is practical and personal.

She describes longevity as ensuring that your healthiest years are still ahead of you, saying it’s about “what does my next decade look like? and the decade after that?” and being able to “be an active participant” in your own life.

This definition aligns with the mission of WHOOP Advanced Labs: to help members optimize healthspan rather than chasing arbitrary lifespan targets.

Why More (and Earlier) Testing Matters

During medical training, Dr. Berzin noticed a systemic fear of “over-testing.” But she saw a different reality: many hospitalized patients were there because early issues were missed.

“Most of these people would've really benefited from more testing if we had gotten to them earlier on,” she explains. Early biomarkers could have prevented or delayed conditions like diabetes, heart disease, dementia, autoimmune disease, and fertility challenges.

WHOOP Advanced Labs embraces this early-intervention philosophy by using a comprehensive, longevity-focused panel to catch subtle trends long before they become problems.

Whole-Person Health Starts with Connecting the Dots

One of the biggest gaps in traditional care is that biomarkers are often evaluated in isolation. Dr. Berzin emphasizes the opposite approach.

She notes that improving long-term health requires seeing “the whole of you,” because symptoms often originate far from where they appear. For example, “sometimes people's brain fog starts in their gut.”

This is where insights on sleep, strain, recovery, menstrual cycle patterns, daily habits, and now labs provide uniquely actionable context.

The Biomarkers Dr. Berzin Says Everyone Should Understand

Dr. Berzin highlighted a few biomarkers as the most powerful for identifying risk early and improving how people feel right away.

Insulin: The Earliest Signal of Metabolic Stress

Dr. Berzin views insulin as one of the most important markers in longevity medicine because it shows metabolic dysfunction long before A1C or glucose rise.

She explains that insulin is the hormone that prevents blood sugar from remaining elevated, but over time “it loses the fight” if the body becomes less responsive. That loss of control is what eventually leads to diabetes — but you can catch it years earlier.

To illustrate the downstream effects of chronic high glucose, she uses a simple analogy: excess blood sugar coats red blood cells “like a Frosted Flake,” reducing their ability to deliver oxygen and contributing to cascading health issues.

The good news is, these changes are reversible. You can “defrost the flakes,” she says, because red blood cells turn over every few months. Lifestyle changes can make measurable improvements quickly.

Thyroid Markers: A Commonly Missed Driver of Mood, Energy, and Weight

Thyroid disorders affect 1 in 5 women, yet are frequently undiagnosed or misdiagnosed. Many of Dr. Berzin’s patients were previously given antidepressants or weight-loss medications, without ever having had complete thyroid panels.

She sees thyroid testing as foundational for understanding energy, metabolism, weight changes, and mood. WHOOP Advanced Labs includes thyroid markers so members and clinicians can catch dysfunction early and tie symptoms back to measurable physiology.

Nutrient Status: Vitamin D, Magnesium, and Sub-optimal Wellness

While true nutrient deficiencies are rare, Dr. Berzin sees widespread “sub-optimization”: people technically within reference ranges but below the levels needed for strong energy, immune health, or recovery.

Markers like vitamin D and magnesium can be improved easily, often resulting in noticeable benefits. “You can use those types of markers and really easy, cheap interventions to change how somebody feels,” she explains.

These markers also pair naturally with WHOOP data: low-normal magnesium may correlate with lower Recovery Scores; low vitamin D with lower mood or feeling sick. 

Female Hormones: A Major Gap in Traditional Care

One of the largest blind spots in conventional medicine, according to Dr. Berzin, is women’s hormone testing. Many women are told to simply tolerate issues like PCOS, PMS, infertility, or menopause without meaningful diagnostics.

She notes that “there’s a lot of resistance…to testing women’s hormones,” despite clear opportunities to intervene through nutrition, supplements, lifestyle modification, and medication.

Women’s Hormonal Insights on WHOOP paired with hormone labs create a more complete picture of female physiology than most clinical environments provide today.

Why Biomarkers and Continuous WHOOP Data Amplify Behavior Change

Dr. Berzin has witnessed how reviewing labs with patients transforms their relationship to their health.

She explains that people often can’t remember how they felt months ago. Lab values provide an objective anchor that helps them understand patterns and progress: “This objective measure then becomes this trackable motivator.”

WHOOP makes that longitudinal context even more powerful by combining:

• Lab results
• Healthspan
• Daily recovery, sleep, and strain
• Menstrual cycle insights
• Habit tracking
• AI guidance

The result is a continuous feedback loop that helps members understand exactly which behaviors drive improvement.

Dr. Berzin emphasizes how valuable this kind of continuous relationship is. Most healthcare today is “episodic and reactive.” WHOOP helps make it ongoing and proactive.

Bringing Whole-Person Health Into One System

The biomarkers Dr. Berzin highlights are deeply interconnected. WHOOP Advanced Labs brings those systems together in one place and pairs them with real-world behavior data.

Whether your goal is to have more energy, improved metabolic health, greater hormonal balance, or long-term disease prevention, these markers offer early, actionable signals that can meaningfully shift your trajectory. With WHOOP, the path from insight to habit to routine becomes more clear than ever before.