I more or less recently have had zero appetite lately as well. A couple days ago I made a pot roast and found that I could barely finish one bowl of it. Yesterday, I had to pretty much force myself to finish my favorite dish (smoked sausage with mustard on the side). My only two explanations are that it might be an acute mood issue (chick issues... Bitches be trippin'), or it might be the 5-HTP supplement I've been taking recently, as serotonin regulates appetite (higher levels of serotonin make you less hungry) and 5-HTP is a serotonin precursor. Just an FYI, I'm not taking it for appetite, I'm taking it for mood and cognition.
So far, the past few days I've been eating about 500 kcal per day. Either way, I'm about 35 pounds overweight, so a several day fast doesn't seem like it'll hurt at all.
"All of God's creatures have a natural habitat... my dinner plate." -Me