Purpose: accelerating autophagy, improving insulin sensitivity and “resetting” the nervous system through cold hormesis.
1 ️ ⃣ Why combine cold with fasting?
2 ️ ⃣ How to prepare (before day 1)
- Check your health— normal tension, without severe cardiovascular disease.
- Choose a post type: 18/6 for beginners, 20/4 if you are already adapted.
- Thermometer for water: Aim for 10-15°C in the shower/bucket; below 12°C only if you're used to it.
- Key rule: first cold, then natural heating (light movement, not hot shower immediately).
3 ️ ⃣ 30-day program (progressive)
4 ️ ⃣ Zi-type (example, “Autophagy Max” phase)
5 ️ ⃣ Quick Precautions
- Cold dermatitis/Raynaud Consult your doctor first.
- Do not stay in water below 10°C if you are alone.
- On days with abundant menstruation → replace the cold with a lukewarm shower, keep fasting light (16/8).
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Yes, 10 min in the t-shirt at 5-8 °C gives about the same nerve stimulus.
Trembling is a sign of thermogenesis; if it lasts < 15 minutes and you can speak normally, that's fine. When you can no longer stand it, stop the exposure.
In theory, alcohol dilates the vessels and “tricks” the brain into being hot — risk of hypothermia! In free translation: better hot, after eating. 🥶 → 🥴 = bad idea.

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