333
Participants
Start Date
August 31, 2011
Primary Completion Date
December 31, 2015
Study Completion Date
December 31, 2016
Metformin
Week 1: 500 mg at dinner time Weeks 2-4: 1000 mg at dinner time Weeks 5+: 500 mg in morning; 1000 mg at dinner time
Placebo
Week 1: 1 pill at dinner time Weeks 2-4: 2 pills at dinner time Weeks 5+: 1 pill in morning; 2 pills at dinner time
Lifestyle intervention
Telephone-based lifestyle intervention (dietary change and physical activity) for weight loss.
Standard printed dietary guidelines
Set of standard health education materials provided to participants at single time point (immediately after randomization)
Moores UCSD Cancer Center, La Jolla
University of California, San Diego
OTHER