Because there is plenty of evidence that saturated fats are much better than the polyunsaturated fats that will be replacing them in this arrangement.

Because people are tired of the "food science"-agriculture-industrial complex selling them magic bullets to a health epidemic of our own making than end up just getting more people obese every time.

Because nutrition is one of the most fraudulent sciences at present, and no one can agree on which 90% of the literature is wrong.

Because the last 70 times articles in popular nutrition were published beginning with "This could be the holy grail to ..." they were wrong.