Interesting, it would be nice to be able to see the full paper. I have seen previous studies showing IHD not correlating to glycemic index (i.e. sugar versus less refined carbohydrates) but correlating with the total glycemic load.
For example, Burkitt studies from British African colonies (1940-ties), sugar cane plantation workers, did indicate a strong correlation between high sugar consumption and diabetes plus other related diseases, with an 18 year time lag. However, the results may be interpreted also in the light of total glycemic load rather that sugar per se.
Similar data exist for cancer, there seems to be a better correlation between cancer and total carbohydrate intake (see for example Mexican women study by Obreu et al) rather than cancer and some particular type of carbohydrate.
In this line of interpretation, the less total carbs intake the better. It is interesting to notice that vegetarian diets tend to be lower in total calories (they are less obese after all, aren't they?), therefore lower in carbohydrate calories than SAD.
H.