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I do a 16 hour fast nearly every day, with an 8 hour feeding window, between noon and 8 pm usually. I've been doing this for several months. Right when I get up (between 7 and 9) I feel quite hungry, but after I have my coffee (within 1/2 hour of waking) I'm no longer hungry for a few hours, although my energy decreases as noon approaches. Is this an unnatural way to go about fasting? I enjoy the 8 hour window because if I have breakfast I want to keep eating shortly thereafter which is annoying and distracting. What would the effects be of stopping the daily fast?

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I do the same thing! – Leigh Jun 24 2011 at 0:19
Me too! Hahaha. – Leisa Jun 24 2011 at 0:55
Have you noticed any improvements in health from your fasting strategies to what you did before? – Mark Jun 24 2011 at 1:15
your tag lines say it all, "coffee IF fasting?" personally, i dont constitute drinking a coffee as an actual fast(dont be discouraged), but maybe it has something to do with your noon fatigue. are you addicted? and what is your sleep pattern like? – OptimusPrimal Jun 24 2011 at 1:20
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yeah, except black coffee doesn't have any calories and is fine to drink during a fast. – Olivia Jul 22 2011 at 2:21
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Just this past couple days I did a fast and coffee was definitely involved.

I had my last protein/fat meal at 8pm, slept, and around 12:30 had a cup of coffee with about 2 tsp half-and-half.

An hour or so after the coffee, I definitely felt the low-blood sugar hunger pains, but didn't eat anything and after about an hour or so it passed.

I ate a full meal around 5pm to break the fast and ate again at 9pm.

The only time I experienced hunger was after the coffee, which, I am assuming, is due to the blood sugar destabilizing effects of caffeine.

Since I didn't take in any food, however, my body eventually gave up trying to get me to eat sugar and went back to burning fat.

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Black coffee is a fine way to start an IF day, as it's a calorieless energy bump that supresses the appetite. Even with heavy cream, the lack of carbohydrate should at least mitigate the calories involved.

If your body is used to the extended fast, stopping it might have an effect on your set point. However, most IFers tend to do it randomly or sporadically, so as to keep the body guessing, and the fat release and metabolism pathways primed.

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I don't agree that coffee suppresses the appetite in everyone - it is known to mess around with blood sugar, especially in those with insulin issues since it activates adrenalin. Julia -perhaps experiment with no coffee in the AM or maybe a swiss water decaf option...it may eradicate your energy drop before noon. Your comment above about breakfast options that don't keep you satisfied - there may not be a high enough fat content in those to keep you going. I have had a lot of success resolving hypoglycemia with more fat...I have a lot more energy and no hunger pangs for 4 hours. – sallycinnamon Jul 8 2011 at 3:41
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I used to regularly skip breakfast out of laziness, disorganization, w/e -- and pre-paleo, if I did have breakfast, thinking I was being healthy -- eat some plain oatmeal, "jump-start that metabolism!" -- I would experience the same hunger surges. Likely part of it was due to my metabolism activating after eating, but I do think it was also due to what I was eating.

Since starting paleo, I notice that I rarely have hunger pangs or even the urge to snack. I'm convinced it's largely due to better nourishment in general -- giving up grains has likely improved my digestive system's ability to extract nutrients from the food that I do eat, and steady consumption of good fat keeps me satiated longer. So, it may have something to do with what you're eating. (What are you eating?)

In general, I've heard that intermittent fasting can be a good thing. Like everything else, though, I would think that changing things up is a key factor. Otherwise, just like exercise, our bodies "figure out" the patterns, and then compensate for it in counter-productive ways (storing instead of burning fat, for example). Is there a reason you consistently limit your "feeding window"?

More info:

Hope that helps!

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When I eat breakfast, I either have eggs with meat and veggies or greek yogurt with berries and nuts. Neither one seems to last me more than a few hours. I limit my feeding window because I feel much better for the rest of the day if I do. However, I'm wondering if it's a good idea or not because I don't really need to lose any more weight and it might help with fatigue if I eat 3 meals. – blur Jun 24 2011 at 23:25

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