November 08, 2022

Do you have a history of kidney stones and are interested in losing weight?

If you are 18 or older with a BMI of 35 or greater, a history of calcium oxalate kidney stones, and are desiring to lose weight, you may be eligible to participate in a research study. The goal of this study is to better understand calcium oxalate kidney stone disease and how weight loss might impact urinary oxalate and kidney stone risk. The study requires eating a study diet for 5 days with a one-day long visit both before and after weight loss, participating in a 14-week long weight loss program with the aid of Optifast VLCD® shakes, collecting 24-hr urines, blood samples, and stool samples. Participants will have the opportunity to be compensated up to $920 for participation in the program over the 6 -8-month participation time frame. They will also receive all Optifast products and study meals for free! For more information email