This just came in on a Google alert. For those who have been reading the latest Matt Stone theories, this might be of interest. I wonder though if this is relevant to "normal" low carbers who don't engage in intense exercise...

Click here to the original article, or read it below:

http://www.bloginity.com/fitness-he...exercise/28848/

amanda

However this study did NOT first correct 25(OH)D status. Men with higher 25(OH)D levels have higher testosterone levels and therefore would be better able to deal with cortisol.

The association between vitamin D and inflammation with the 6-minute walk and frailty in patients with heart failure. shows that people with higher 25(OH)D are better able to perform physically and have lower cortisol levels.

This study only tells us what happens in Vitamin D deficient individuals.

Because we all life under the same polluted skies and most consume foods that induce vitamin D insufficiency we must assume that everyone is vitamin D insufficient unless they are taking EFFECTIVE amounts of vitamin D3 supplements.

That's the low carb lowers testosterone study. Thirty percent carbs is the low carb.



Well, yeah, you can compare




to weight training if you want. But it isn't weight training. When it's expressed in terms of maximal oxygen consumption, that's endurance. So I'd add "in a certain way" to if you exercise.

There was an article posted a few years ago about sex-hormone binding globulin; free palmitic acid decreased binding of free testosterone in the liver, increasing levels of free testosterone. One way to increase palmitic acid in the liver is to eat carbs, and hope that your liver makes some fat. I'd rather just eat some palmitic acid and cross my fingers. Can't tell from the abstract whether these guys ate any palmitic acid or not.

Thirty-percent carbs might be enough to keep blood free fatty acids low, but not enough to spur much palmitic acid production in the liver, especially if a lot of those carbs are going towards repleting muscle glycogen.

I've seen no evidence on this forum that low-carb is a cure for testosterone-poisoning, at least in men, lol.

30% of 2500 kcals is 750 kcals and this translates to 187g of carbs. I don't know of a single low carb plan with such a high carb count at any stage of the plan. Consequently, they did not test a low carb diet.


If that were true, we would be able to store much more than just a couple thousand kcals of carbs at any one time. And storing carbs would be much more efficient than it is now (about 1kcal per gram stored compared to 9 kcals per gram for fat: Remember water-weight?).

Certainly, an adaptation to several million years of natural selection. I don't see how "an adaptation to several million years of natural selection" is not considered "a natural state".

That makes no sense. Heavy lifting requires more anaerobic than aerobic capacity, at least that's what the lifting world believes. And anaerobic ATP production can only be done with glucose. And long distance running requires more aerobic capacity which is much more efficient with fat and ketones than with glucose.

Now I understand the bullshit.

What of the fact that heavy lifting i.e. intense exercise stimulates growth hormone?

http://en.wikipedia.org/wiki/Growth_hormone

Influence of Commercial Dietary Oils on Lipid Composition and Testosterone Production in Interstitial Cells Isolated from Rat Testis
Interesting to see that Testosterone concentration was higher in Olive Oil and Coconut groups compared with Soy or Grapeseed

Note that in the same way testosterone concentration directly correlated with cholesterol levels, so vitamin D3 production in the skin depends on cholesterol levels.
Low cholesterol in skin = low vitamin d production.

One could argue the reverse quite successfully too. Especially if one has any notion of what humans ate before they discovered agriculture.

Interesting program on NEANDERTHALS BBC RADIO 4 this morning.
You can listen again if you've 45mins to spare.
Interesting to hear how much meat Neanderthals ate and the importance of bone marrow and that the organ meats were probably eaten raw straight after the kill and probably only the stuff carried back to the cave was cooked.

Yep, I think you hit the nail right on the head here Martin.

does anyone have some anecdotal evidence like...I eat low carb and have tons of muscle and am in great shape? Lots I imagine. Is there ever room for "hey look at me". That just proves the point? Its hard to see a "study" like this and not know what opinions the testers had from the onset.

This is fitness trainer conventional wisdom. They actually said this in class in my college fitness trainer program.

Preferred for what? well, exercise, the thing we are promoting. The whole rest of the day, fat is the preferred fuel. When I asked this question in class - how can you say it's preferred when more time is fueled by fat - the teacher looked at me like I had two heads. When exercise is the main thing, and you need sugar for exercise, and the harder the exercise the more sugar, then voila sugar is the preferred fuel.

No one else in class seemed to think this was nuts.

The study lost all credibility when they made 30% out to be ketogenic. I do weight training, and almost no carbs. My results have been kind of confusing. I have gotten steadily stronger, increasing the weights as I go, and my muscles have become much more defined. However, they have enlarged very little. This has been over the course of about four months, maybe a little less. Now, in all other regards, there is no question in my mind which fuel source works best. I have more endurance and a stronger immune system on extremely low carbs, and feel like shit when I eat more than a gram or two at a meal.

Hey Seejay!!!

Just a minor quibble: the way you've quoted what was in the article looks as if I actually wrote it, not that it was in the article I found!!!

I just wish to make it clear that I did not pen the words above!!!

amanda

Gotcha amanda, I was able to edit and fix it.

Thanks so much!!!

amanda