Well if the "yummy" food makes you feel bad, it would take all the enjoyment out of it for me.

I know some foods (processed ones) make me feel worse, so I stopped enjoying them gradually.

You can gradually ween of sugar. And then foods start to have more taste than "sweet". and if you are not used to the sugar anymore, eating the sugary foods... you no longer enjoy them. They taste sweet and gross, opposed to more refined tastes of other foods.

(that said... I have no problem giving up sugary foods because my go to comfort foods involve meat and spices. I go for fuet salami and blue cheese when I want to comfort myself, as opposed to cupcakes or the cheap sweet version of "chocolate").

Seriously, junk food is not so tasty. I don't consider it all gross and ewww and I am not healthy freak, but after trying various meals and becoming a good cook... most of experience with junk food is... that it feels rather dissapointing. It's plain. It's basic. It's the contemporary pop music of food. Looks appealing but once you get through the whole meal, it's sorta... blah. While chicken in orange-ginger glaze... is just more satifisfying.