Jury is still out on this one.
And I think lumping all seed oils into one category isn't helping. Maybe canola oil is OK and sesame oil is not. Or vice versa.
The history of cotton seed oil is interesting. After reading that, I would challenge people to think if that's really something they'd want in their body. Other than cost, I see no downside to avoiding seed oils and a lot of upside: https://en.wikipedia.org/wiki/Cottonseed_oil#Economic_histor...
> Other than cost, I see no downside to avoiding seed oils and a lot of upside
The taste of food in certain recipes (that don't involve cooking the oil) varies widely with the oil used. In some recipes, canola oil tastes better than olive oil (by a significant margin - no one would eat it with olive oil).
Cost was never a factor for me (even as a student). Oil is amongst the least expensive things in the food I cook.
Olive oil definitely has a flavor, but other oils are pretty neutral (I cook with avacado oil because of the high smoke point and I don't notice it really effecting anything). Also you have to keep in mind that those seed oils have a neutral flavor because they've been through a deodorizing chemical process, otherwise they'd taste/smell rancid.