To requote Merchant's press release describing the intrinsic biases of "usual" dietary research:
"Previous research has identified ethnic differences in cholesterol and other blood fat levels that couldn't be explained by genes, obesity, lifestyle factors or diet, Merchant and his team note, but these analyses usually looked at dietary fat, not carbohydrate consumption"
When Edefonti did actually look at starch based diets and cancer he observed this sort of thing:
"In conclusion, the starch-rich pattern is potentially an unfavorable indicator of risk for both breast and ovarian cancers, while the animal products and the vitamins and fiber patterns may be associated with a reduced risk of breast and ovarian cancers, respectively"
Mind you, the same group has been saying the same thing since 1996!
Now, from where do low fat diets derive their calories?