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Just A Theory wrote: There is next to no evidence that increased sugar intake promotes insulin resistance.

This is incorrect. The evidence is rather strong. An experimental model of insulin resistance and hyperinsulinemia induced precisely by a (low-fat) high sugar diet can be found here: http://jap.physiology.org/content/84/4/1311.full

Just A Theory wrote: Glucose consumption does not alter resting insulin levels nor does it promote insulin resistance.

Incorrect, re: both the short and the long term. In the short term, dietary glucose raises blood glucose and immediately triggers insulin secretion. In fact, the concentration of insulin parallels that of glucose.

In the long term, high sugar intake (determined as glycemic load) is independently associated with insulin resistance and hyperinsulinemia.

Just A Theory wrote: By contrast, high fat intake can and does lead to elevated insulin resistance.

Sorry, in the abstract you linked there is no support for your dismissal of the role of dietary sugar in insulin resistance. (And, it's a study on diabetics -not healthy people).