Kayla Barnes-Lentz: The Woman Rewriting Female Longevity from the Inside Out

Kayla Barnes-Lentz has spent over a decade doing something almost no one else in the longevity space has done: publicly tracking and publishing her own biological data as a woman, across cardiovascular markers, telomere length, ovarian age, hormonal biomarkers, and performance metrics. 

Widely recognised as the most publicly measured woman in longevity, she co-founded one of the US’s most advanced longevity clinics before turning her focus entirely to female-specific longevity research - an area she argues has been systematically underfunded and underrepresented in clinical trials. 

Her cardiovascular and telomere biological age currently measures eleven years younger than her chronological age. 

In this interview, she shares what actually moved the needle, what expensive interventions she has since abandoned, and why the protocols most women follow were never designed for their biology.

1. You’ve been in the health optimization space for over a decade - long before longevity became a mainstream conversation. What originally pulled you in, and how has your approach changed over the years?

It's been a slow build. I've always been an entrepreneur, and I knew that in order to build my dream businesses and dream life, I would have to be incredibly productive and work long hours. My initial interest was human optimization for the sake of my entrepreneurial journey. As I began to feel better with each intervention, I went all in. In 2018, I prepared to open a longevity medicine clinic with a partner and overnight had access to thousands of labs that my doctor had never recommended. 

This is when I got ultra deep in biomarkers and advanced therapies such as hyperbaric oxygen chambers, NAD+ IVs, plasmapheresis, etc. In the early days of my protocol, I was following more male-specific or male-optimized interventions. 

For example, as a lean woman in my 20’s I incorporated caloric restriction, which is a highly cited longevity intervention, and it dysregulated my cycle and slowed my thyroid health. It was then that I took a step back and hired a small team of female PhDs to pull the literature on female health. There wasn't much. Women were only required to be included in clinical trials since 1993. So I worked with my medical team to build a female first and bio-individual protocol. 

2. You’ve built an entire protocol framework specifically for women. What are the top 2-3 areas where female optimization looks fundamentally different from what’s commonly recommended?

1. Starting with inherited biological risk, the longevity risks that women may experience differ from men. We have significantly different hormonal experiences throughout our life that need to be taken into account. Women's immune systems also age differently (women are 80% of autoimmune conditions) Women are also two-thirds of Alzheimer's diagnoses. 
2. Women have ovaries, and men obviously don't. The ovaries in a woman are the pacemaker for aging. Prioritizing ovarian longevity is something that we are newly speaking about. We know that when a woman's ovarian longevity comes to an end and she enters menopause, the risk of all-cause mortality increases substantially.
3. There's also nuance in nearly every foundational protocol for women. Women tend to need more sleep than men, and they also report higher levels of sleep fragmentation, especially in specific phases of life such as perimenopause and menopause. Women also report higher levels of anxiety and depression. This needs to be taken into account and addressed in a female longevity protocol. Exercise requirements for women can change throughout the lifespan. Women start with naturally lower muscle mass, so amendments need to be made in order to maintain and add on strength. Also, bone density is a massive consideration for women. As we know, some interventions such as caloric restriction, for example, could not only negatively impact hormonal cycles and thyroid health as they did for me as a lean woman, but also contribute to accelerated bone loss. When we look at things like pharmaceutical interventions, there is also a massive disconnect in what works well for men and what may work best for women.

3. Your biological age has been reported as 11 years younger than your chronological age. Which interventions do you think moved the needle most - and which expensive tools turned out to be less impactful than expected?

My cardiovascular and telomere as is around -11, my ovarian age is -5 (Ovarian age does not operate off of the same timeline,as the entire ovarian lifespan is only about 40 years so -5 at 35 is the best the testing company has seen).

And without a doubt, it's mastering the basics:

• Many years of exercise with a focus on improving strength, muscle mass, and VO2 max
• Years of sleep optimization consistently in the 90s on Oura 
• High quality nutrition 
• Not drinking alcohol 
• Prioritizing stress reduction 
• Sauna / reducing environmental toxins 
• Social connections

I am sure that some of the higher-tech interventions, such as hyperbaric oxygen, nutrient IV therapy, and therapeutic plasma exchange to reduce environmental toxins, etc., have played a role. I believe mastering the basics and having a consistently healthy routine is what moves the needle the most. 

4. You’ve said the basics matter more than any tech. If someone has access to a sauna, PEMF, red light, hyperbaric oxygen - but their sleep is inconsistent - where should they actually start?

They should start by:

• Improving their sleep
• Getting morning sun
• Watching evening sun
• Setting up their sleep environment to be cool and super dark
• Stopping eating at least three hours prior to bed

These advanced therapies are great, and may be able to mitigate a small % of the deleterious effects of poor sleep, but people should focus the most on the highest leverage behaviors, sleep definitely being one of them. As an example, I own a hardsheel hyperbaric oxygen chamber and If I had to choose between a great night of sleep and a hyperbaric session, I would choose the sleep. 

5. You see high-performers at your clinic regularly. What health issues surprise successful founders and executives the most when they actually start testing?

For factual purposes, I exited the clinic last year, but based on my experience running it, a plethora of findings emerge when you dive deeper than standard Western labs. Cardiovascular disease is the number one killer in both men and women, and often times important markers like Lp(a) and ApoB are never checked. Patients would come in with a high cardiovascular risk and not even know it.

Most individuals suffer from low energy or fatigue. When you dive deep into their biomarkers, you often find nutrient deficiencies, problematic gut health and more. 

Also, many of the high performers, prior to having a total toxic burden test conducted on them, would feel they would have a low level of toxins, considering they were doing many things right: drinking filtered water, maybe an air purifier at home, etc. It was incredibly rare to ever find an individual with a low toxic burden.

6. Our community is mostly founders and executives who already invest $1,000-10,000 annually in their health. With that budget, what do you think most people are over-spending on vs. under-spending on?

I think people are overspending on trends and underspending on lab testing.For example, buying a ton of supplements that you may or may not need. The ideal thing to do is lab testing. Dive super deep and see what your body is actually telling you it requires for optimal health, and then you can put together a precision protocol based on that. I also think that people are spending before optimizing the foundation. Yes, you can use some of these modalities to expedite healing, but many of them also work better with a good foundation.

7. The wellness space is flooded with products and claims. How do you personally evaluate whether a new supplement, device, or protocol is worth trying? 

I am in a unique position, given that I have an entire team of advisers and the majority of my friends are doctors or researchers; but in general, I would look at studies to validate the outcomes and work with your doctor.

8. You’re vocal about social connection as a longevity tool - weekly dinners with friends, regular hosting, even marriage optimization meetings with your husband. Why does this matter as much as the protocols?

It's not just my opinion; this is the supported by the science. Feeling lonely can be as dangerous to the human biology as smoking. 

9. What’s the one area of longevity science right now that you think will change how we all approach health in the next five years?

Likely gene therapies, similar to BHRT, where we are replacing hormones that have declined. I think in the future we will be going to our doctors to get a gene therapy to re-optimize other important systems for health (i.e tune up our immune systems, or nutrient sensing).

10. Longevity protocols can look like a full-time job - bloodwork, devices, supplements, clinics. Is the current longevity movement becoming an elite hobby for the wealthy - and if so, how do we prevent it from losing relevance for the average person?

That is certainly how the media is portrayed, and yes, it can be an expensive game if you want to do absolutely everything and anything. The great thing is that we have the data to support that mastering the basics will optimize your health completely. Other tools such as testing are coming down in price substantially, more competition enters the market.

11. Many longevity protocols are still derived from male-centric research. Are there popular interventions that you believe are actively suboptimal - or even harmful - for women when applied without cycle-aware adjustments?

1. Caloric restriction (in some women, lean women)
2. Metformin as a longevity drug is another one worth flagging. It can lower androgen levels, which is therapeutic for PCOS but potentially problematic for women with already-low androgens. It also blunts the exercise-induced mitochondrial adaptations that women may need more of, not less, given sex-based differences in mitochondrial density and function.

12. Looking back at your protocols from five years ago - which interventions did you strongly believe in that you’ve now deprioritized or completely abandoned?

1. Lots of IV therapies, I had unlimited access at the clinic and they can be great but I overdid it, we now know those IV therapies can deliver microplastics, and I likely didn't need all of them.
2. I have also abandoned incorporating new supplements without testing or a very good reason for taking them. Does my body need them, have they been lab tested, these are questions I take much more seriously now. 

13. For a busy-professional: what delivers the biggest longevity return per hour invested?

1. High quality sleep 
2. Exercise (High intensity combined with strength throughout the week) 
3. Social connections 
4. Proper nourishment (eliminating processed foods and alcohol)