I think it depends on a few things - the lady at the school could have other things on her mind that are making her less cheerful, or if she's on a regime that means she's hungry and tired that could well be the reason. I have dieted to extremes in the past and was definitely Not Fun. I might have looked good but I was miserable! Life is too short to count calories or exercise obsessively, IMO. Changing to a healthy lifestyle should make you feel better, not worse
