A stunningly good, extraordinarily comprehensive paper on the health effects of saturated fat in our diets has weighed them in every relevant way, measured them with every pertinent metric, and found them wanting. There are no saturated fatty acids shown to be better than harmless at best, and those we consume most often and abundantly in fatty meats, processed meats, fast foods, dairy and processed dairy products are decisively worse than that. They are bad for us.

Until rather recently, the idea that pepperoni pizza, ice cream, and bacon were far from good for our health would have evoked nothing beyond a yawn. We all knew that already. But the world of nutrition is stunningly good at following every action with an equal and opposite reaction, and propagating pseudo-confusion, generally because there is profit in it. Confusion is profitable for iconoclasts with conspiracy theories to sell. It is profitable for publishers, who always have the next revolutionary diet in the queue. It is profitable for the media, which seek to keep us unbalanced and tuning in for the next fix by comforting us when we are overly afflicted, and afflicting us when overly comfortable.

We had, presumably, grown comfortable with the notion that broccoli and beans were good for us, bacon and bratwurst, not so much. So we were due for a dizzying dose of affliction, and over recent years, we have been so served. If you have not heard that saturated fat is good for us now, that butter is back, and that we should all praise the lard, then please tell me where you live. I will move in next door so I can avoid all this nonsense, too. Im a good neighbor.

Its simply not true that we would be better off eating more meat, butter, and cheese to say nothing about how that would devastate the planet. Its simply not true that saturated fat has been exonerated and is good for us now, simply because sugar is known to be bad. Its not true that nutrition experts have focused only on saturated fat, while ignoring sugar. Instead, its all the same constellation of lies repeated so often by those who simply like hearing them, that they have been adopted into the current cultural lore as gospel.

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I read the scientific literature as a matter of routine and professional obligation, and consider this new paper in circulation one of the more impressive evidence reviews I have ever seen. The paper is clearly intended to address all of the popular arguments about saturated fat with methodical, evidence-based dispassion. Accordingly, it encompasses both systematic literature review and meta-analysis of research data. The paper explores mechanistic research, observational epidemiology, and human intervention trials. Appropriately, impressively, and somewhat unusually, the authors base their conclusions on the confluence and overall weight of such diverse and complementary lines of evidence.

The authors systematically address not only the lofty claim that saturated fat was unfairly convicted of crimes against our coronaries, they also explore every component part of that revisionist history. They examine the evidence linking saturated fat to elevations of blood lipids, notably LDL, and the evidence linking LDL to coronary disease. They parse out the effects of diverse fatty acids and their darling sources, from coconut oil to chocolate. Throughout, they are attentive to the instead of what? question so crucial to nutritional epidemiology, and so often overlooked. They even address the studies that disagree with their primary conclusions, and openly explore reasons for diverging results.

The evidence in this laudable paper is transparently displayed for all to see, and it is followed by the authors where, and only where, it leads. It does not lead to the foolish conclusion that the harms of excess bacon-cheeseburgers preclude the harms of excess french fries, or soda. The right remediation for bad diets is good diets, not alternative diets, equally bad.

Refined carbohydrates and added sugar are bad for us, but demonstrably no worse than saturated fat from the usual dietary sources. Saturated fat from less usual sources, such as coconut and cacao, is less harmful and perhaps innocuous, but not beneficial. In contrast, unsaturated fat from the usual sources, notably nuts and seeds, olive and avocado, fish and seafood is beneficial. So, too, are vegetables and fruits, beans and lentils, and whole grains.

When the net health effects of saturated fat are weighed and measured on scales unbiased by foolishness, fanaticism, and pecuniary motives, they are found wanting. All of us wanting the application of just such scales, and a fair accounting of the overall weight of evidence to inform our dietary choices and support our health owe the authors of this standard-setting paper a debt of gratitude. And just maybe in select cases and the fullness of time our lives, too.

Dr. David L. Katz; http://www.davidkatzmd.com; founder, True Health Initiative

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Dr. David Katz, Preventive Medicine: Saturated fat is weighed, measured, and found wanting - New Haven Register