Um in genetic engineering people might not follow the ethics of the profession.
An average school aged child (usually 5+ years) needs anywhere between 1,600 and 2,500 calories per day.
Social factors like media can lead to the development of an eating disorder. Magazines, television, etc. can inspire an individual negatively and cause them to develop ed. Peers can also inspire individuals to develop ed.
Hope I somehow helped, I'm still an amateur.