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 Since April, all throughout winter in Tasmania I’ve finished very single shower on cold for a minute. Have had nary a sniffle since. Coincidence? 
 #Hormesis 
A Cold shock stress is a hormetic response that causes all kinds of genes that turn on/off to cycle on more frequently.  All kinds of positive things happen when you introduce hormetic stress.

Others include:
Sauna (heat shock)
Fasting
Exercise 
Fasting
& eating some types of vegetables. 
🧡👊🏻🍻🥩