T Nation's own article seem to make the implication: http://www.T-Nation.com/free_online_article/sex_news_sports_funny_grok/the_taming_of_insulin
I am by no means an expert, but there seems to be just as many studies proclaiming the relationship as there are discounting it. E.G one of the first websites that poppoed when Googled.
Two hours after glucose administration, the testosterone level remained
much lower than before the test in 73 of the 74 men, a statistically
significant difference, the authors reported. Of the 66 men who had
normal testosterone levels before the test, 10 (15 percent) became
hypogonadal at one or more time points during the test.
The results did not differ by changes in insulin levels, according to
the abstract. Other hormones that could change testosterone measurements
also did not appear to affect results. Hayes said more research is
needed to find the factor or factors responsible for this drop in
Because glucose intake, and likely food, decreases testosterone, she
said, "This research supports the notion that men found to have low
testosterone levels should be reevaluated in the fasting state."