Peter Attia did a 7 day water fast as an n=1 experiment and took a zillion blood tests.
#11 - AMA #2: the Nothingburger — results from Peter’s week-long fast between two weeks of nutritional ketosis — and answering questions on all things fasting - Peter Attia
He said that he wanted to be saving money on food (a joke?) but that he wants to understand fasting better. For example, he has absolutely no idea which fasting protocol is best, and he says that prpproba nobody knows, but he'd like to research it later. It is not known how frequent fasts should be, how long they should be, and how that depends on the person.
Blood tests were all weird. Testosterone and insulin crashed to very low levels, some of his thyroid numbers were the worst he has seen, and he quoted lots of different cholesterol numbers that I did not understand .
Some subjective changes:
- sense of calmness and high concentration, for example he noticed that he stopped putting his earphones on
- better sleep, he says that he wishes that he could sleep that way all of the time. In contrast, he has had terrible sleep when doing the fasting-mimicking diet of roughly 700 calories/day.
- no loss of strength during weightlifting. He estimates that he lost no measurable amount of lean tissue, and maybe 6 lbs of fat.
- some laziness for movements, he was sluggish walking, he took more taxis for routes for which he's never taken cabs. His wattage on some "peloton" workout (???) dropped by a lot. He says that relative to his former self he was at least 60-80 watts less capable.
- his chronic pain in one spot went away, and almost went away in another spot. He said that the fast was worth it just for that.
I've never tested my strength to that level of detail during a long fast. This guy was doing squats, etc. He followed exactly the same program as he does when not fasting.
I do get sluggish walking, but I force myself to walk to stimulate gluconeogenesis.
The heightened sense of awareness is incredible, I wish that I could maintain it all of the time lol.
@DramaticGloveSave is enraged by this post, as fasting is the ultimate carnivore diet: calories during fasting come from 100% fatty cuts of human meat ;-)