> Specifically vegetable seed oil, like sunflower oil or canola oil.
Please be more specific, my understanding is there is no easy X is harmful in nutrition. Your example vegetable seed oil:
Refined sunflower oil at high temperatures --> bad
Cold pressed sunflower oil --> ok (great source of Vitamin E, but too much omega 6 compared to 3)
Cold pressed linseed oil --> good
> The other thing I'm very skeptical of now is milk replacements, like oat milk.
Could you elaborate? You can make oat milk easily at home. Let oat flakes soak in cold water over night, blend, sift, done. Go fancy and add a drop of rapeseed oil (will work as a natural emulsifier) and a pinch of salt.
The other thing I'm very skeptical of now is milk replacements, like oat milk.
For cooking just use olive oil, coconut oil, or regular butter.