A theory on this is that if your water consumption is making your stomach expand, that could cause a rise in insulin, and push down glucose. Given you’re on day 37, you may be fat-adapted, but the time required varies, and can be longer for some folks, so you might not be fully there.
So assuming both insulin rise, and lack of full fat-adaptation, it would not surprise me for hunger to increase.
Interesting…thanks for the insight! I’ll try smaller sips of water instead of chugging a litre at a time 
I’m going to start a 7 day fast. Starting tonight. Water, coffee, tea…and nothing added. Here I go…!!!
How much water would you be having daily? Also going to try a 7 Day fast starting this Sunday, atm having about 3 ltrs daily. 
I’ve been doing Keto about 8 months. I started fasting at about 2 months in with a 24hr fast at least once a month for about 3 months. After getting used to that now I do a 5 day water fast once a month and at least one 24hr fast as well. The longest water fast I’ve ever done is 8 days and I broke the fast with steak. 
I don’t measure volume of water I’m drinking. I just drink lots of glasses all day long.
I’m on day 7 of my 1st fast right now. Once this week I added 1 T. MCT to some green tea; & another time I used 2 T total heavy cream for 3 cups of black tea. It probably satiated hunger a little, & it did seem than my blood ketones were higher at next measurement; did not raise my BG or slow weight loss. However, if I did that multiple times or daily, it might be a different story.
Im on my first 24 hr fast. I daily practice 18:6 and find this works for me most days. It really is mind over matter I think because I felt a bit panicked when my stomach growled. I was actually thinking of not going through with it and eating something. Instead I hopped on my treadmill and walked till I had my 10000 steps. I just finished reading Jason Fung/Jimmy Moores book on fasting which gave me the confidence to continue. I was one of those people who seriously believed fasting was dangerous! Sheesh! 
Easing into extended fasting just finished my longest - 34 hours, not long I know but at the end of it I had blood glucose of 4.3mmol/L (80mg/dl) which equals the lowest reading I have ever had as a T2D for over 5 years. Ketones also measured 4.3 which is almost double my previous highest ever measurement - I am stoked! Doing this length of fast after 12 days of zero carb has turned out absolutely awesome.
When you guys fast, what work do you guys do?
I’m a personal trainer and I’m pretty active with my clients. My longest fast was only one day then I wouldn’t think I would go well afterwards with all the physical things I do with clients.
The leaner you are the shorter your fasts will be purely do to activity and low access to BF.
how did it turn out for you? made it 46 hours yesterday but had to end it, i got to light headed and jittery. next time i will cut down on coffee on day 2
It worked out well. I went from Monday night until lunch on Saturday. The only thing I took other than water the whole time was one magnesium and one potassium tablet on Tuesday night. Otherwise, just water. I never felt shaky or got a headache. My only problem was that I thought about eating the whole time. I really wanted to eat…I wasn’t hungry…I just wanted food.
So coffee as well makes you jittery. I find I can fast alot smoother without coffee.
Here is an article saying caffeine can boost your metabolism depending on body fat percentage.
