Let me introduce you to mTOR: the switch that shapes aging🧬
Feb 10, 2026
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Hi Friends🙋♂️,
Over the last couple of weeks, we talked about what and when we should eat.
Today, I’d like to go one level deeper.
We’re going to look at what’s happening inside our cells—and how certain cellular switches respond to our lifestyle, especially our diet, in ways that affect health, disease risk, and longevity.
This will be a two-part series. I decided not to compress everything into one email, because when it comes to scientific information, for me clarity beats speed.
So today we are going to talk about mTOR and next time talk about AMPK. (I know it doesn't tell you so much but we will explore everything.😁)
Yes… it’s time for a little cell biology. (Yoho 😄)
How your cells actually work
Your cells are not passive. They constantly scan their environment and respond to signals.
Depending on what they “hear,” a cell may:
grow💪
divide← →
repair itself🌱
or, when necessary, shut down.⏼
Think of your body as a small city. Each cell is a house. Inside each house are specialized workers with specific jobs. One of the most important is the mitochondria the cell’s power plant. This is where nutrients are turned into energy, known as ATP. (This is going to be more important in the next newsletter)
But energy alone doesn’t decide what a cell does.
Cells respond also to signals such as:
food and calories🍽️
protein🍗
stress😣
damage from free radicals ☢️ (which can trigger inflammation)
And among all these signals, the activation of one pathway plays a particularly powerful role in aging.
mTOR the growth accelerator
mTOR stands for mammalian target of rapamycin.
The name comes from rapamycin, a compound first discovered in the soil of Rapa Nui (Easter Island). Scientists later found that rapamycin blocks this powerful growth pathway, that's why the name called mTOR.
(PMID:1102508)
You can think of mTOR as the gas pedal of our cells and it is a major regulator for growth in our cells.
When mTOR is active, it tells:
Resources are abundant. Let's grow. Build as much as you can and divide.
(PMID:31937935)
This is essential at certain times of life:
childhood👦
pregnancy🤰
wound healing❤️🩹
muscle growth💪
Without mTOR, we wouldn’t develop or survive.
When growth becomes a problem
But here is the most important thing about mTOR:
Chronic activation of mTOR accelerates aging.
mTOR doesn’t just promote growth it also suppresses autophagy, the cell’s internal recycling and repair system.
Autophagy is how cells:
remove damaged components⛓️💥
recycle old proteins♻️
clean up internal “junk”🗑️
When mTOR is constantly switched on, this cleanup process is turned down.
Thousands of years ago, this wasn’t a problem. This was essential. Humans lived shorter lives, food was scarce, and growth needed to happen quickly to pass on our genes. High mTOR activity made sense.
But today?
We live in a world of:
constant food availability🍔
frequent eating🔄
high-calorie, high-protein diets🍗
And this keeps the growth pedal pressed all the time.
mTOR, protein, and IGF-1 - How are these connected?
Do you remember IGF-1 from our previous newsletters?
IGF-1 is one of the strongest activators of mTOR.
(PMID: 26773603)
High levels of IGF-1 often driven by high protein intake, especially certain amino acids found in animal sources, send a powerful signal for cells to grow and divide.
That’s helpful for building muscle.
But long-term, persistent growth signaling is associated with:
accelerated aging🧬
inflammation🔥
increased cancer risk🦠
This is one reason why longevity research consistently shows that less constant stimulation of growth pathways is linked to longer, healthier lives.
Growth is not bad. Uninterrupted, constant growth is the problem.
Can we influence mTOR?
Fortunately, yes, very much so.
Lifestyle, especially dietary choices strongly affect how active this pathway is.
(PMID:20519118)
Look at this diagram!
 |
What tends to activate mTOR:
calorie-rich diets and high protein intake, especially amino acids like leucine and methionine (found mostly in milk, whey protein and caseine).
Actually, if you think about it totally makes sense: the purpose of drinking milk for a baby animal is to grow as much as possible in the shortest amount of time.
This could be a scientific explanation of why consuming too much dairy and whey protein can cause prostate or breast cancer. Scientists also show that high levels of mTOR connected to acne, which explains why stopping drinking animal milk helps reducing acne.
(PMID:26203267)
What tends to quiet mTOR:
calorie restriction⛔️
coffé☕️
green tea 🫖
certain vegetables🥦
(PMIDs:31937935, 28526373, 21300025)
Cruciferous vegetables like broccoli and cauliflower contain compounds (such as sulforaphane and diindolylmethane) that appear to help downregulate mTOR signaling.
What does this mean in real life?
This isn’t about eliminating growth entirely. You are able to build and maintain muscle mass with lower levels of mTOR.
It’s more about balance. ⚖️
Here are a few simple, practical ideas:
Add broccoli or cauliflower to one meal a day🥦
Drink 2–3 cups of coffee daily ☕️
(decaf works too and still appears to influence mTOR-related pathways)
Drink 2 cups of green tea daily 🫖
And of course, choosing whole foods more often instead of constant calorie-dense snacks always a good option.🌱
Coming up next ...
Today we talked about mTOR, the growth accelerator. Maybe you were wondering, if there is a gas, there also should be a brake...
Next time, we’ll meet AMPK the cellular brake and repair switch and explore how fasting, movement, and low-energy states activate the body’s deep maintenance systems.
Thank you for joining!
I hope you enjoyed.
If you found this valuable, please don't forget to share this newsletter with one of your friends or relatives!
See you in the next one,
Cheers,
Bazil