I want to be thinner because

I want to be good enough for them, and not to embarrass myself around them.

When I have short hair I feel more efficient, and a similar feeling comes from being thinner.

A horrible spiteful bit of me thinks, you want me to give up sugar Mum? Screw your halfhearted hints and your worry about how others are judging me. I'll look like a skeleton and then let's see.

Of course, the logical reaction would be to gorge myself stupid.

I won't have to throw out my clothes.

I'll feel more confident.

I'll move freer.

I'll have some control over something.