Longevity Code: Best of 2025
Your 5 most liked and shared newsletters of the year
Like most people, I like to pause and reflect at the end of the year.
I started Longevity Code in January with the aim of bringing a scientific voice to a space full of noise.
I’m genuinely obsessed with health and longevity science, and I’ve loved every part of building this community.
I hope it’s brought you real value — feel free to reply to this email if it has!
As I reflect on the year, I wanted to take you with me.
I’ve pulled together the top 5 posts of 2025, since moving this newsletter to Substack in September.
Top 5 Posts of 2025
We’ll start at number five and count down to the most popular post of the year.
#5
It’s no surprise this was one of the most popular posts of the year.
We’re living in the most overstimulating era in history:
Constant notifications and dopamine hits
Work and financial pressure
Exposure to global crises our brains were never wired to witness
Ongoing health concerns
In this post, I break down evidence-based habits shown to lower cortisol, reduce low-grade inflammation, and help you show up calmer and more present in daily life.
#4
This post covers 7 simple but genuinely impactful habits that target the biological aging process.
I break down everything from movement routines and circadian health to sauna use and fasting — all grounded in human biology.
#3
This was a short, simple list of swaps — a reminder that the most powerful changes you can make to influence the aging process are often the simplest ones, done consistently.
You clearly like lists like these, so there’ll be more to come in 2026 🙂
#2
It’s great to see that so many of you are just as fascinated by nutritional biochemistry as I am — the science of how food interacts with our biology.
Food can act as a form of armour against the processes of aging and chronic disease.
Many people fall short on key micronutrients, even with a generally “healthy” diet.
In this post, I break down five micronutrients worth getting right for longevity, and why they matter.
#1
Here we go…
The most liked and shared newsletter of 2025 was:
In it, I give a clear overview of 20 key things everyone over 40 should know, based on my experience as a bioscientist studying aging.
The response to this post was a strong signal of something important:
There’s a real appetite for simple, science-backed information when it comes to aging.
I shared a similar version on Instagram in April, and it brought over 20,000 new people into the community.
This is one of my favourite messages to share — simple, comprehensive, and genuinely impactful.
Thank you for being here! I’d love to hear how you’ve found reading this newsletter this year.
All feedback is incredibly valuable and helps me refine things to make them as useful and impactful for you as possible.
Short or long — just hit reply to this email.
That’s it for now!
Best wishes,
— Ollie
Disclaimer: This post provides educational information based on scientific research and is not medical advice. It does not establish a doctor-patient relationship. Always consult a qualified healthcare professional before making lifestyle changes, addressing medical conditions, or starting new treatments.
Looking forward to learning more in 2026 - thanks Ollie! 👏