Huge drop in body temperature?

[Robb Wolf]

Fasting will DEFENITELY decrease body temp. Scotty and i have noticed this for a long time. It's nice in the summer, hell in the winter. Shorten the fast periods as folks have recommended...make IF work for you, not against you! Basic paleo/zone eating to far too effective to introduce an undue amount of stress.

[Gittit Shwartz]

I like to use seaweed in place of pasta - soak it and put meat sauce on top. The texture is close enough if you can ignore the smell of sea.

[Robb Wolf]

Gettit! You are a WILDWOMAN!

[Jeremy Shepard]

Has anyone noticed the opposite?

I tend to sweat a bit more during the fast, although I also get right at zero noticeable thermogenic effect from carbohydrate overfeeding.

[Mike ODonnell]

Interesting find on hypothyroidism and fasting:

Dr. Ray Peat: The amount of glucose in liver cells regulates the enzyme that converts T4 to T3. This means that hypoglycemia or diabetes (in which glucose doesn't enter cells efficiently) will cause hypothyroidism, when T4 can't be converted into T3. When a person is fasting, at first the liver's glycogen stores will provide glucose to maintain T3 production. When the glycogen is depleted, the body resorts to the dissolution of tissue to provide energy. The mobilized fatty acids interfere with the use of glucose, and certain amino acids suppress the thyroid gland. Eating carbohydrate (especially fruits) can allow the liver to resume its production of T3.

http://www.thyroid-info.com/articles/ray-peat.htm

and

Thyroid problems can stem from prioritizing cortisol so T3 does not get made, from inadequate iodine in the diet, or from a liver that is struggling in its detoxification role and can’t make the enzymes necessary to convert T4 to T3. The other halogens like chlorine and fluorine have a higher affinity for the iodine receptors than iodine does, so drinking chlorinated and fluoridated water may be responsible for an inability to absorb iodine, and thereby affect thyroid function. Another important reason to filter our water! Goitrogens like processed soy and peanuts also block the absorption of iodine. Omega 6 vegetable oils are usually already rancid when consumed, and the oxidative processes seem to damage enzyme activity, increase inflammation, and block production of thyroid hormone. Coconut oil, a medium-chain fatty acid seems to aid thyroid function. Mercury in the body displaces selenium, which is needed to convert T4 to T3.

http://blog.wellnesstips.ca/blog/index.php/?p=110

[Garrett Smith]

Hypothyroidism, due to any number of factors, is the main reason why I think some people do not respond well to IF (or can't do it at all without major symptoms).

[Mike ODonnell]

If one thinks they may have hypothyroidism....how much of that is really due to a strained/damaged/fatty liver that can not produce enzymes to convert T4 to T3 vs having disfuctional thyroids? (of course I understand the only way to really know is through blood tests) I mean if you start to IF and you are still eating a good amount, then feel cold....wouldn't that signal something else going wrong in the whole process...or is that really the down regulation of the thyroid not producing enough T4?

Also how much of just only "feeling cold" could also just be due to poor adrenal function vs hypothyroidism? (too much excessive cortisol, stimlants and other factors?)

[Garrett Smith]

MOD,
That's why I put in the "due to any number of factors"...

Clean up the diet, the liver gets better and insulin comes down, the thyroid will likely just kick back into gear.

Get enough sleep and don't overdo exercise/stress(-ors), along with proper nutrition, both the adrenals and thyroid come back on line.

[Mike ODonnell]

Originally Posted by Garrett Smith

Get enough sleep and don't overdo exercise/stress(-ors), along with proper nutrition, both the adrenals and thyroid come back on line.

The times my hands and feet felt the coldest were days of poor sleep habbits and too much coffee....so makes sense to me.

[Dan Heaney]

I have an average waking temp of 96.4 but I'm not really cold all the time. Right now I IF 1-2 days a week. I want to go to every other day for 14-16 hours. Should I not do this becaus of my low waking temp with seems to indicate a metabolic slowdown?

Thanks