During which period of development do people typically face new issues, which may lead to eating disorders or substance abuse?
Most people start to face new issues at the ages of 11-13 some may gain this at older ages, but it typically starts around that time, some causes of this are: Puberty;School; Problems at home; etc.
Teenagers being influenced by new things or even adults entering their 20s because things get hard sometimes as a adult and being legal and able to drink can turn into something negative for some .