Ow does body dissatisfaction in men lead to eating disorders such as anorexia

I would like you to use the mini questions below in an extended literature review:
1) The scope of the problem in the UK
2) Does Age, sexual orientation and social Class have a part to play
3) Does body dissatisfaction in men contribute to health problems with alcohol and drugs which can lead onto disordered eating or is it the other way round
4)Does the media have a part to play.

I am interested in the key arguments and findings around the above questions, any counter arguments and then some critique and any limitations in the articles used