Feb 16, 2026
What if stubborn weight gain, brain
fog, poor sleep, and chronic inflammation aren’t “just aging”—but
signals from your gut that started decades earlier? Today’s
conversation challenges the myth of inevitable decline and shows
how understanding your microbiome can make your chronological age
truly just a number. After 40, many people find that diets
stop working, digestion becomes unpredictable, hormones feel out of
control, and inflammation quietly creeps in. This episode
explains why gut healing becomes harder with age, what’s
actually changing biologically, and how restoring gut resilience
can transform metabolism, hormones, and healthy
longevity.
Today’s guest brings a rare blend of microbiome research,
systems thinking, and real-world clinical insight to guide us.
Martha Carlin is a pioneering citizen scientist and microbiome
systems researcher. She is the founder
and CEO of The BioCollective, collaborating with
institutions including Caltech, the University of Chicago, and
University College Cork. Her work focuses on how gut microbes
drive inflammation, insulin resistance, and chronic disease as we
age. Martha’s mission began personally—after her husband’s
Parkinson’s diagnosis—leading her to leave a corporate career to
investigate healing at the root: the gut.
Episode Timeline:
00:00 — Aging symptoms, gut health, and the microbiome
03:30 — Why gut issues worsen after 40 and why aging conversations miss the microbiome
05:10 — Martha’s personal journey into microbiome science after Parkinson’s diagnosis
08:45 — Antibiotics, missing microbes, and early Parkinson’s gut research
12:30 — What biologically changes in the gut with age
15:40 — Endotoxins, gram-negative bacteria, and chronic inflammation
18:20 — Constipation as an early warning sign, not a nuisance
21:00 — Surfactants, cleaners, bile acids, and hormone recirculation
23:40 — Soil microbiomes and what agriculture teaches us about gut healing
26:30 — Food quality, seed oils, and modern processing challenges
28:40 — Beet kvass and fermented foods for nitric oxide and gut support
30:20 — The estrobolome, cortisol, insulin, and hormone–gut feedback loops
33:00 — Practical first steps to restore gut resilience
36:30 — Common mistakes: extreme diets, fasting, and overcorrection
39:10 — Women, cortisol, and metabolic backlash
41:40 — Listener guidance: simple daily changes that matter most
43:30 — Guest resources
Call to Action:
Connect with Martha Carlin:
https://www.instagram.com/
https://www.facebook.com/
https://www.youtube.com/@
https://twitter.com/biotiquest
https://www.linkedin.com/
Connect with Dr. Gillian Lockitch
Download your guide to
Build Back a Better Body:
Strengthen Bones, Muscles, Joint and Fascia
Connect with Dr. Gillian Lockitch at askdrgill@gmail.com to request a phone conversation or zoom call
Share the Growing Older Living Younger podcast link for anyone you care about and invite them to subscribe