I taught Eating Behvaiour last year and will be doing so this year - there are a lot of theories, but students enjoyed it. My resources are still very much in the design and improve stage, so I don't have anything decent to offer.
However, one thing I found was that, once teaching of the topic had finished, a question on biological explanations for obesity confused them - they included material from biological explanations of control of eating behaviour; the problem seemed to be that they interpreted the findings from research on damage to the hypothalamus resulting in obesity in unique cases or in experimental research with animals (fat rats) as being an explanation for obesity, generally. This year I will be emphasizing that explaining control of eating and explaining obesity are different.
Best of luck in your teaching!