Just as bad is the egg and dairy industries. They spend millions on phony research that tells people that dietary saturated fat and dietary cholesterol don't increase serum cholesterol. They do. They create faulty studies where they take people with already high cholesterol and feed them these foods, and it doesn't go up much because cholesterol levels horizontally asymptote. Take someone with an LDL of 50-70 (ideal, hunter-gatherer levels), feed them saturated fats and/or cholesterol, and cholesterol skyrockets. The other trick is to do cross sectional cohorts which the american heart association and the american college of cardiology have repeatedly said are inherently flawed because there is a "wash out" effect in these cross-sectional populations.
But of course, there's a huge market out there for "ketogenic" diet, which is not the clinical form of ketogenic diets that was created in clinical settings to help with intractable seizures in epilepsy patients where they are fed MCT oil and vitamin pills, instead it's just Atkins diet being called "Keto".
All of these recent studies "debunking" previous, well-established studies are from industry, just like all the sugar studies sponsored by industry, as well as the cigarette studies sponsored by industry (doctors used to PRESCRIBE cigarettes to pregnant women, that's how fucked up it was!).
If you like sugar, listen to the lies that sugar industry tells you. If you like fat, eggs, and butter, listen to the lies that the egg and dairy industry tells you. Heck, if you like cigarettes, go back and read the countless studies that were poorly designed but showed incredible benefits (you won't find them on pubmed because they were expunged, but you can look at the archival journals).
The unbiased, unsponsored science is clear: you should limit or ideally avoid fat (particularly saturated fat), all dietary cholesterol, processed sugar, refined or processed grains, and salt. Eat whole unprocessed foods with plenty of spices, herbs, and non-sodium seasonings, all the while not eating an excessive amount of calories and maintaining a healthy mixture of micro and macro nutrients.