Overweight/Obese adult volunteers needed for study If you are between the ages of 18 -89 yrs and have a body mass index > 30 kg/m2 you may be eligible to participate in a study exploring the reason why individuals who have high BMI have an increased risk of forming calcium oxalate kidney stones. Participation involves eating study-provided meals for 4 days, providing urine and blood samples. Study meals are provided free of charge and additional compensation up to $140 is offered. For more information call 205-934-5712 or email kidneystone@uabmc.edu or kidneystoneresearch@uabmc.edu