Finally it seems to be acknowledged that all the low fat information was nonsense!
An article in the New York Times says Butter is Back
Possibly the best bit was 'there's just no evidence to support the notion that saturated fat increases the risk of heart disease'.
I think the best advice is to eat good quality meat and dairy, ideally direct from local suppliers - go to farmers' markets, talk to the producers about they make things. Replace fake food with real food.
The main villians are sugar and ultra-processed foods (including the low fat foods that are often full of sugar) - however consider just reducing these, rather than going for 'no added sugar' as these raise their own issues that maybe worse than the sugar!