Time for another butter-buster. This study ( full-text ) compared a low-fat diet to an Atkins diet. It was a six-week study that looked at various markers.
The result: the Atkins diet significantly reduced flow-mediated dilation (FMD).
“But it wasn’t a true low-carb diet”. Grams of carbohydrate were kept under 25 grams per day over the whole course of the six-week study. “But they weren’t low-carb adapted”. Then why did FMD get worse as the study went on, not better?
This study also has some other interesting points that I will circle back to.