Hi, Jon
[you wrote]
> Just seems like everything I take -- especially EC and CLA --
> purportedly reduce insulin sensitivity.
I know how you feel. Lyle's comment "your body hates you" seems apt here.
> There are a lot of insulin sensitizers, mimickers and even
> secretagogues out there (vanadium, ALA, chromium,
> 4-hydroxyisoleucine, etc). I just wanted to know how to
> use them most efficiently.
My guess is that the above mentioned supplements will not have the desired effect. Did you know that CLA and EFA are insulin _sensitizers_ for obese mice (people?!
? Similarly, I believe ALA's insulin sensitizing effects are directed to obese mice as well, not in lean mice (people).
The problem here is that the insulin "insensitivity" in lean mice is not the same thing as that in obese mice.
In both lean and obese critters, insulin spikes occur because their bodies are having difficult time finding storage space for excess energy. In the obese critters, it is as if their bodies want to spend any extra energy and not get fatter. Thus, it takes higher and higher dose of insulin to shuttle glucose into fat cells. On the other hand, the lean critters are insulin "insensitive" because existing energy depot (fat cells) cannot store nutrients without the "pressure" generated by insulin. Once in a while when excess energy comes in (most of times it is in caloric deficit mode), therefore, the body has to do everything it can to store that. Naturally, one will have a high insulin spikes.
Thus, in both lean and obese critters, the high insulin concentration is due to the body's attempt to force glucose into "unavailable" energy storage space. But as you can see, the bodies are attempting to do different things for different states of leanness. In one case, the bodies want to get rid of excess energy; in the other case, the bodies want to store it.
CLA / EFA make fat cells more efficient in releasing energy for both lean and obese critters. In the obese critters, that results in insulin _sensitivity_, because by making bodies spend more energy, the bodies can find more room to store energy. Thus, it won't take as much insulin to shuttle nutrient to the available storage space.
In the lean critters, CLA / EFA's effect on fat cells results in insensitivity, because as the supplements make fat cells inefficient at storing energy, it takes more and more insulin to force nutrients into the fat cells.
I think the preceding logic may extend to other supplements you mentioned.
==============================
BTW, the effects of insulin insensitivity are _traditionally_ considered harmful in the context of obesity / diabetes research. I don't think there has been any research on the effect of "insulin insensitivity" in the context of lean critters.
It is something that is probably rarely seen in nature, because in normal lean critters, when excess energy comes in, they are stored efficiently (fat calls can multiply). For insulin insensitivity to persist in lean critters, their fat cells (energy storage mechanism) must to be messed up.