Not yet investigated
What we have so far
Too little fat causes the same metabolic disease as too much, which is the cleanest proof that the problem is where fat goes, not how much there is.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.