Why does everything I eat taste so nasty it makes me gag?

Stuff I know I love has been making me almost physically sick for about 2 weeks now. I take a bite and it’s so horrible I gag and have to spit it out. I completely lose my appetite, although I’m still so hungry.
I want to accuse who ever made the food of using bad ingredients, but it’s too common now so I don’t think that’s it.
And yeah. I’m losing weight.