When you donate to The Obesity Society (TOS), you become a champion in the battle against obesity—because your funds support vital obesity research and programs.
Your generous contribution will positively impact the lives of millions of people affected by the disease of obesity by helping to further the understanding, treatment, and prevention of obesity and its complications. Questions? Please email us at [email protected].

By supporting TOS with your gift, you assist us in our mission to provide support for the professional development of scientists and clinicians working in this critical area of medical research as well as supporting critical efforts in evidence-based policy development and patient advocacy.

Become a distinguished member of the Founders’ Circle today! The Founders’ Circle recognizes the vision and dedication of our founding members by helping to support the mission and special programming provided by TOS via unrestricted monetary gifts that support evidence-based scientific and educational research, clinical training programs, and patient health education programs. As a Founders’ Circle member, you will be recognized as a donor for Founders’ Circle programs.

Please choose the Founders’ Circle level that’s right for you:

  • Member – minimum gift of $50
  • Supporting Member – minimum annual gift of $200
  • Sustaining Member – minimum annual gift of $500
  • Visionary Member – minimum annual gift of $1,000
Please write “FOUNDERS’ CIRCLE” in the memo field on the donation page.

Become a Legacy Member of the Founders’ Circle with a gift in your will. This gift gives you a chance to deepen your connection to TOS and provide ongoing support for the mission of the society. If you wish to join the Founders’ Circle as a Legacy Member, please email us at [email protected].

The Obesity Society is excited to announce establishment of The Xavier Pi-Sunyer Award in honor of Professor Xavier Pi-Sunyer, MD. Dr Pi-Sunyer is a founding member of The Obesity Society and served as President from 1994-1995. Please click here to learn more about his dedicated service to the obesity community. Donations are being taken in order to establish an endowment for the purposes of perpetuating this Award. Please click here to download Endowment Gift Agreement to view Terms & Conditions of your donation. For donations of $25,000. or more, Endowment Gift Agreement must be completed and signed by Donor and TOS representative.

NAASO, The Obesity Society, Inc. is a registered not-for-profit 501(c)(3) organization. Donations, whether made online or by mail, are non-refundable. No goods or services will be provided in exchange for your donation. Your donation is tax-deductible to the extent allowable by law. Our federal tax ID number is 54-1438429.