I also am not a fan of Dr Mercola (nor other doctors who jumped on the keto bandwagon without understanding its limitations) but do agree with him that a "high fat keto diet" is not optimal long term. He is evaluating a Review paper of many other studies which indicated the cardiology problems before. https://www.sciencedirect.com/scien...4000410#abs0002

Doctors like Peter Attia (Outlive) evaluated the research 3+ years ago and abandoned Keto diets and fasting except for therapeutic use.
https://peterattiamd.com/ketogenic-...t-for-everyone/ (2021)

Elevated blood lipids on "keto" are a huge confusing topic, but after ten years of defending my wonky cholesterol results (to my Duke GP) I added more nutrient dense healthy carbs, like vegetables, fruit and NF yogurt, and removed the heavy cream, high fat cheese, fatty meats, sausage, pepperoni, etc. to improve those numbers and my nutrition.