11 minutes cold, 57 minutes heat: the weekly dose for metabolic health
September 29, 2026 · 25 min read
Susanna Søberg's winter swimmer research, Huberman's cold and heat episodes and Rhonda Patrick converge on modest weekly doses of cold and sauna for brown fat, insulin sensitivity and heart health, ending on cold. It turns vague advice into a specific, achievable target.
The rules, numbers and steps worth keeping in front of you.
- Susanna Søberg's weekly dose: about 11 minutes of cold and 57 minutes of sauna over two to three days.
- Søberg's swimmers: up to three dips of up to two minutes, plus two sauna sessions at about 80°C for 10 to 15 minutes.
- Søberg: always end on cold so the body rewarms itself and keeps brown fat active for hours.
- Søberg: short bouts beat one long sit; get in, get out, get back in.
- Søberg: 12°C water or 19°C air can activate brown fat; ice is not required.
- Andrew Huberman: treat 11 minutes as a minimum, split into two to four sessions; progress once it feels easy.
- Huberman's sauna guide: 80 to 100°C for 5 to 20 minutes per session.
- Huberman: immersion to the neck beats showers, which beat cold air; move your limbs.
- Huberman: avoid cold immersion for about four hours after strength or muscle-building training.
- Finnish data: four to seven sauna sessions a week went with about 50% lower cardiovascular death than one.
- Rhonda Patrick: sessions over 19 minutes drove the big heart effects; 11-minute sessions cut risk by only about 8%.
- Patrick: browning fat will not replace diet and exercise for weight loss; never mix sauna with alcohol.
- Huberman: drink at least 16 ounces of water per 10 minutes of sauna.
- Never swim alone; see a doctor first with heart, blood pressure or pregnancy concerns.
This is the short form. The full insight has every expert's reasoning, their own words and the sources.