Glad to hear Dr. Fung's book sales are rising. I thought he sounded disappointed, maybe even a little bitter, when it first came out and didn't take off like a rocket.
I drink a lot of water when I fast. And yes, I'm a bit colder overall, as with low carb, or just eating less in general. It is a nice benefit, but I'm getting really bummed about the super cold feet. I had a diabetic exam in March that included pulses and sensations in my feet that were ok, and I see my doctor again in a few weeks. She'll probably tell me to quit fasting!
Doing a little additional research on potassium, the problem seems to be that the kidneys can't clear very much at one time, so I think if I space whatever amount I take throughout the day, I should be ok.
Incidentally, for anyone stumbling upon this topic for the first time, as some always do, I find that drinking tea is essential to my fasts. I've never been a tea drinker, but found white tea, which is just less processed green tea, is very mild tasting. I only fast 24 hrs at a time, so never really get past that point of being hungry, but I believe the tea is an appetite suppressant because it seems to help a lot. I add salt to it or coconut oil, or olive oil or whatever I'm doing.
I joined a weight loss group last summer. (Called
The Happy Losers ) I am the only low carber, which surprised me a little out of a core group of about 12. Anyway, I brought some books in recently and prompted at least two sales of
The Obesity Code for Dr. Fung, and even one of the fasting book.