Stress causes me to lose weight. I lost about 35 lbs when my husband died. (a long time before I was sleeved) I wasn't eating differently. If anything, I was eating more because I turn to sweets in times like that.
Recently, around Christmas, I had a big family emergency and I was stressed out for about a month, and I lost 10 lbs. During that time, I went to Disneyland, and ate junk food for a week.
Unfortunately, once the problem was resolved, I gained it back. I was not overeating or anything. I just went back to my normal weight.