[bagacrap]

Industrially produced seed oils are thought to be unhealthy due to an over-abundance of Omega 6. But some regulatory authorities still cling to the decades-old wisdom that basically boils down to avoiding saturated fat at all costs, so they'll recommend vegetable oils over animal products.

There are definitely healthy fats and unhealthy ones, for example everyone can agree trans fats are in the latter category. The perfect fatty acid profile is a matter for debate but it's definitely possible to isolate bad ingredients by a variety of means (populational studies, etc). It's not easy though, if it were then there wouldn't be so much debate in this space.

[tuukkah]

If you're afraid of consuming too much Omega 6, choose oils with more Omega 3 such as flaxseed and rapeseed. Also:

"[We] have known about the harms of fatty acid imbalance, and an excess of omega-6, for a long time. So much so that sunflower oil in the US was 'upgraded' through selective breeding to produce a high-oleic-acid variety (high monounsaturated fatty acid) that now prevails, and AVOIDS the potential harms noted in this paper. The same thing is now being done to soybean oil, and the high monounsaturated fatty acid version of that will soon replace the old variety.” https://www.forbes.com/sites/alicegwalton/2016/04/13/the-ani...