It's more true that if your blood glucose had gone up, your insulin would have gone up. Going in the other direction--a large drop in glucose could be evidence that insulin went up, or the insulin:glucagon ratio went up in insulin's favour. What actually happened is what you'd expect if pure fat had little effect on insulin.



There's a risk here, sometimes I see it when people are testing artificial sweeteners. If glucose goes up--people say it's evidence that insulin went up. If glucose goes down--they can say the same thing. Because--glucose going up increases insulin, right? But insulin going up decreases glucose... So any change can be evidence that insulin went up.

It would actually be reasonable to suggest that insulin might have gone up if glucose stays the same, but that glucagon might have gone up to match.

If all this confuses the issue, my work is done.