I thought these Peatarians were nuts, but sure enough, eating one meal of my usual amount of carbs as apples instead of rice (2 med Tango apples instead of ~ 1 cup basmati rice) has raised my temperature a full degree and finally given me the warmth I've been looking for. I thought I was hypothyroid due to an iodide and/or selenium deficiency, but I guess I was just not eating enough fructose. I never thought I'd say that last bit. I've tried simply grotesque amounts of starch and it doesn't come close.
Anybody else try this out? This is like a dream come true. This could actually make this latitude tolerable and I may be able to forgo my daily shaking-fist-at-the-heavens routine.
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Superhumanradio had a podcast where one scientist marked that about 10 grams of fructose minimum enchances glucose metabolism somehow. Its always cold where i live, what makes greatest difference to me is not to do IF and expose yourself sometime to cold. I mainly do it walking without a shirt in winter, while the sun is shining. I also went shirtless to see how much i could absorb vitamin D3 in a period of 6months, i got my levels up to 108 nmol/l, which is just where you want them to be.
This is interesting to me and I've been recently reading Danny Roddy's "The Peat Whisperer" and Matt Stone's "Eat For Heat" in this regard.
I personally haven't noticed being warmer after eating a large apple, but I'll pay more attention.
According to The Peat Whisperer, fruit supports oxidative energy (CO2) to a higher degree than starch/glucose. Also, increased fiber in starch is more difficult to digest and is considered a drawback. Whole body and splanchnic oxygen consumption and blood flow after oral ingestion of fructose or glucose: http://www.ncbi.nlm.nih.gov/pubmed/8476028
Peat emphasizes easy to digest and well ripened fruits, like pulp-free orange juice or citrus fruits, watermelon, grapes. It'd be interesting to see how those might compare to apples.
Eat For Heat might sound somewhat counter to Peat Whisperer and suggests fruits are cooling foods, due to high water content, low calorie density, and high potassium to sodium ratio. Essentially, a whole foods diet is more cooling since the water content is higher. Recommends adding salt to high potassium foods to make them warming and potatoes can take a large amount of salt before they begin to taste salty. Of course Peat also recommends large amounts of salt (pickling salt free of iron, heavy metals).
I've found drinking less water and eating more salt is warming.
Fructose provokes greater thermogenesis than other carbs:
Edit: Just noticed your "thermogenesis" tag #lolz so my links are irrelevant because you already knew that. So I will answer your question and say nope, I've personally never noticed that warm feeling after eating fruit.