Hello,
Thank you for your question and participation.
One option would be to check with your employer or insurance provider to explore if a weight loss program such as the Mayo Clinic Diet Experience at the Healthy Living Program would qualify for your personal Healthcare Saving Account reimbursement. Here is a link to the website: https://healthyliving.mayoclinic.org

I'm not aware of a current clinical study specific to weight loss, but these are always changing. For more information you could visit: http://www.mayo.edu/research/clinical-trials?_ga=1.66517294.101447869.1440799368