Cold Exposure for Women: What the Science Actually Shows
By Dr. Susanna Søberg, PhD · soeberginstitute.com
Last time I wrote about sauna and heat for women. Today I want to do the same for the other half of thermal science. It is the half that is even more dominated by men.
Cold has a loud, male voice online. The coldest plunge. The longest hold. The colder the better. Very little of that conversation was built on female physiology, and almost none of it accounts for the fact that a woman’s response to cold changes across her own month.
I have spent my research career studying how the body responds to cold, including where women and men diverge. So let me be precise about what the science actually shows for women, what is still emerging, and what you can do with it.
Women are not smaller men
In the cold, this is not a slogan. It is physiology.
Women generally have a different distribution of subcutaneous fat, a different surface area to mass ratio, and a cold response that is modulated by oestrogen and progesterone. The temperature that feels bracing to a man and the temperature that feels genuinely stressful to a woman are often not the same. And the point at which cold stops helping and starts simply draining you arrives at a different place.
This is the first thing most cold content ignores. It hands women a dose that was never designed for them, and then treats the struggle as proof it is working.
The one thing to take from this, even if you read no further
Colder is not the goal. The goal is a controlled stress that your nervous system can actually recover from.
For women in particular, more cold and longer holds are not more benefit. Past a certain point they are simply a bigger bill for your body to pay. The adaptation does not live in the shock. It lives in the recovery afterward. If the dose is so severe that you spend the rest of the day depleted, you did not train your system. You taxed it.
That single correction changes how most women should practice. Not harder. More precise.
How to apply that precision, across your cycle and across the decades, is what the rest of this piece is about.
Why we still do not have the answer
I want to tell you why the honest answer to “what is the right dose for a woman” is still “we do not fully know,” because the reason is not innocent.
For most of the history of physiology, the default research subject was male. Not out of malice, but out of habit and convenience. Female bodies were treated as complicated, because the menstrual cycle introduces variables that are harder to control for. So women were left out, and the male result was quietly assumed to be the human result.
I grew up as a scientist inside that system. It shaped how I was taught to design a study, and it was genuinely difficult to break. When I ran my own research on cold and heat, I did the proof of concept first in men, because that was the accepted path, the one that gets approved and published. Only afterward did I run a randomised controlled trial in both men and women.
I am not proud of the order. I am telling you anyway, because it shows how deep the default runs, even in someone determined to challenge it.
Times are changing, and I am glad they are. But glad is not enough. This gap does not close on its own. It closes because people decide to close it.
The research women are still owed
The real answer for women will not come from a single afternoon in a laboratory. It will come from studying many women, over time, in their actual lives, across their actual cycles and their actual decades. That is the research I am now committed to building, and in time I am going to invite you into it. The women who practice this every day deserve to be the ones the science is finally built around, not the ones it forgot to include.
That work is coming. For now, below is what the current evidence lets me say with honesty.
Inside the full piece, for paid subscribers:
Why my own research started in men first, and what that admission tells you about the whole field
The safe threshold I am willing to draw when the science will not, and why staying silent is the real risk to women
How to adjust your cold dose across the phases of your cycle, follicular and luteal
What is genuinely proven about cold and the female metabolism, and what is being oversold to you
What changes in perimenopause and menopause, and what the emerging evidence actually suggests
The provisional dosing principles I give women as a safe place to begin
Paid subscribers also become the first cohort of the research I am building on women and thermal health. This is where that work starts.
You deserve precision in this space. You deserve to know how to take care of yourself, on your own physiology, with real evidence behind it. That is what I am building, and what I teach at the Søberg Institute.
If you want to learn in debth, these courses will teach you how:
→ The 3 Week Thermalist Cure® — soeberginstitute.com
→ Søberg® 12-Week Reset — soeberginstitute.com