Well its not publically available necessarily. You need access to journals through an institution. Its basically a friend of mine who is a massive health geek and reads journal articles as bedtime reading
I've read some of the stuff myself, but alot of it is him summarising the content of the studies he reads. But when he has time he says he'll gather some links together.
And I think our ideas of 'disastrously unhealthy' are quite different. You seem to be thinking of it like I mean poison or something. I'm comparing unhealthy foods and their effects on the body to healthy foods. In terms of the many detrimental effects that sugars, carbs, grains etc have on the body it is disastrous when you compare it to other foods a person could be eating which conversely lead to high improvements in health. Apart from carby foods actually being linked to slowing down metabolism, studies have also found them to be anti-nutritious
in the sense that they inhibit the ability of the body to store or utilise vital micronutrients like key vitamins or minerals, and they weaken the body's immune defence (this is all off the top of my head from many of the articles he described to me recently) those are only a few details too - I'm not mentioning alot of the significant diseases which its strongly correlated with.
And on the sweetner and insulin spike thing, again I see it as 'disastrous' in comparison to the impact of other healthier foods on insulin, whereas I'd imagine that regulatory bodies compare the spikes caused by sweetners to some sort of measure of 'how high can this person's blood sugar increase and drop without it risking their life?' As I mentioned before, they approve of diabetics eating starches and complex carbohydrates (not to mention fruit) which are the sorts of food that cause the insulin issues that the research I refer to has linked to loads of major health problems.
In terms of what you said about it being less calories - yes I agree that that is a benefit. In my first reply to you I clearly delineated between ways in which it is not like sugar and therefore is better, but there are also sides in which the body responds to it as it does to sugar, and in those specific senses it will be harmful.