By Marika Sboros

The diet-heart hypothesis is a curious creature. To some scientists and physicians, the hypothesis that saturated fat causes heart disease is a zombie. Despite all the stakes they drive deep into its heart, it just won’t die.

To others, it’s written in scientific stone. That’s even when supporters, such as Harvard nutrition and epidemiology professor Walter Willett, call it “incomplete” and “overly optimistic” in its classical form.

The hypothesis hovered in the wings at a groundbreaking conference in Zurich, Switzerland in June. That’s when it wasn’t taking centre stage. Willett and others vigorously dispute the notion of any terminal hole in the diet-heart hypothesis.