Here is a post about fats from the same author: http://theincidentaleconomist.com/wordpress/a-study-on-fats-...

Conclusion:

"Should we be eating more polyunsaturated fats? Should we be avoiding saturated fats? The honest answer is: I don’t know. Given my review of the evidence, I stand by my previous recommendations [1], which essentially focus more on foods and less on nutrients. I think the state of nutrition research in general is shockingly flawed."

[1] http://www.nytimes.com/2015/04/21/upshot/simple-rules-for-he...

"Moderation in all things".

- Roman playwright Terence, circa ~200 B.C.

Still good wisdom, twenty two hundred years later.

The best advice I've received(which is a combination of journal science and self-experiment) is to moderate it when pairing with carbs - so perhaps lay off the butter cookies or cheeseburgers and fries, but don't be too worried about having a frankfurter with some condiments or a fried egg by itself. The saturated fat acts as an accelerator to the carbs, making it hit your system harder. When consumed apart, they don't have the same interaction.

(of course, once you start looking at how restaurants use saturated fat, it's easy to see that this advice is violated constantly.)

absolutely, as long as you still get enough protein, vitamins, and fiber and remain within your target calorie intake. (hard to do that if you're eating 1,500 calories of butter though of course) not a nutritionist but i did stay at holiday in express last night.

I find Authority Nutrition a useful guide:

https://authoritynutrition.com/foods/butter/