There’s no point repeating it. This kind of study is hopeless for answering this sort of question. People go on this kind of diet because they’re concerned about their health, often their weight and general cardiovascular health. It’s not surprising that they’re more likely to die of things related to their reason for going on the diet in the first place.

It’s not quite as starkly obvious as “people who choose to jump out of planes are more likely to die in a parachute accident” but it’s close.