http://perfecthealthdiet.com/category/nutrients/carbohydrates/ Interesting stuff. Apparently a moderate fasting blood sugar (95 mg/dl) correlates to a LOWER mortality rate than not only the higher (105) but also better than the lower (below 90) fasting glucose. Also suggests that if you have been eating low carbs for a while, then you actually will NOT handle sugar as well. There had been speculation that glucose tolerance would improve after periods of low carbs. Supports the hypothesis that medium level of carbs (25% of cals) is healthier than low or high (although amount of aerobic exercise performed might require more carbs for recovery). So also carbs may not work for you if you don't use them regularly.
No evidence that low carbs improve insulin sensitivity. I am a bit confused though considering the post workout window, but it looks like the post workout window, as well as supercompensation may not be due to insulin response at all.