Please correct my grammar errors

Volunteering DEOS A BODY GOOD.

In "Volunteering Does a Body Good," Haupt states that the return for someone who helps others
is he or she will forget his or her own stress and depress. *[According to Haupt, when someone
helps other people, that person will forget his or her own problems and it is believed as a
new science]*. Haupt also refers to a variety of studies that suggest people who do volunteer
work have better health, less tress, longer lives and well-being. According to Haupt,
volunteering especially beneficial to adults 65 and older. Volunteering enhances seniors'
social networks and helps them stay active in the community. However, Haupt states that only
the effective volunteer programs can benefit volunteers. In conclusion, people will receive
more than what they give when they help other people.

I know I have a lot of grammar errors .Please point of my errors .Thank you.