More weight loss

I've been monitoring my weight these past couple of months ever since I've discovered that I've lost weight since February. And the latest is I have continued to lose weight: My weight lately has been hovering around 107 and 108 lbs--that's two or three lbs down from last time! The cause remains a complete mystery to me. Things are definitely more hectic at work now that we're back in the regular semester and I'm beginning to eat snacks again once in a while. So it can't be due to lesser stress during the summer months.