But it's not political battles (well, there are but they aren't the only issue), it's that there is actual conflicting information in the studies. And there are

But it's not political battles (well, there are but they aren't the only issue), it's that there is actual conflicting information in the studies. And there are past well regarded studies that have since become controversial. Or put another way: it seems there is a lot we do not understand about nutrition, we merely convinced ourselves we did.