http://www.brighthub.com/mental-health/eating-disorders/articles/103961.aspx
Having a strong, healthy attitude about who you are – feeling good in your own skin – has a huge impact on many aspects of your life. Work with horses improves self-esteem, builds self confidence and leads to feelings of empowerment. We come to value who we are and 
the strengths we develop. Horses could not care less about how we look. To them we are measured by how we act and react as part of the herd. Are we honest? Do we come from integrity? Do we know how to be playful? Through horses, these are the things we come to value.