"Check the nutrition facts label. If it has any trans fat, put it back."

Trans fats are now banned in the US so there's not much of a need to look.

just went shopping yesterday (Southern California) and much of the peanut butter still has trans fats.

There's many brands which have fully-hydrogenated oil, but I'm not aware of any still using partially-hydrogenated (what people typically mean when they're talking about trans fats), and I don't believe they're allowed to now.

That's easy. The packages are labeled with nutrient information, don't eat any that contain any amount of trans fats.

Also as a side note, hydrogen isn't a noble gas

I know. I edited my comment to correct that. Apologies for the error, hydrogen fans!

I'm a big fan of hydrogen, particularly the collaborative work with oxygen. You could say that it's central to my life.

I think this would mean eating nothing but home cooked meals or a 3x in grocery bill. I'm not even sure of the latter strategy

Really? Most food products I see, even processed ones, don't have trans fats.

What foods do you buy that do?

Trans fats are banned in the US: https://www.fda.gov/food/food-additives-petitions/trans-fat

I don't live in US. HN is a international community, please be mindful of that.

No.

> which food products

If it comes in a tin or a box, it is probably not good for you. Not all cases, but it is a good rule of thumb.

Sardines are a tasty exception