Is DPS food even worth using?

[Vodomir]

Doesn't answer the question XD Black truffle Risotto is the 2 star version of Buttons, and gives a paltry 15 determination. I agree on using Acc food if needed as there is then a tangible benefit, but 15 Det adds practically nothing to your DPS. Hence the original question.

I know which foods to use. Question is it worth it?

Well, you get DET and CRIT out of Risotto/Buttons. Theory crafting has shown that capping out on accuracy via gear and using risotto/buttons is superior to purposefully staying below the Acc cap and using deviled eggs to reach the cap (unless your gear doesn't allow to reach the acc cap, then deviled eggs are the way to go). As miniscule the DPS gain from using buff food may seem to you, it still DOES add to your DPS. It also adds to your health pool and therefore increases your survivabiliy. There's no good reason to be lazy/avaricious and not use buff food if you are going for challenging content. Remember that the sum of small increases adds up to a noticeable difference, so if everyone in your raid opts for not using food (as it "adds practically nothing"), then you may end up failing a DPS check you may otherwise have beaten.

So for challenging content, yes, it's worth it. For trivial content or stuff you have on farm, well, it's not that necessary.