What are your challenges with losing weight?

I'm a regular MFP user and have been for years. I'm very interested in how apps like MFP and Fitocracy can help can behavior. Currently I'm doing research on weight-loss and have a short anonymous survey to help gather info on the most common types of challenges people have when trying to lose weight. I will be happy to share my results with you guys on this message board later in the week when I've tallied all the responses.

Survey:
http://www.surveymonkey.com/s/KXQCQ5Z

My top challenge is emotional comfort eating. When I get down, I look to things like pizza, nachos, and beer to make me feel better. I know it's short-term, and that's what helps me stay committed to healthier choices. It's still a challenge though! How about you?

Thanks in advance to all who respond!

Curtis G. Schmitt