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 This email address is being protected from spambots. You need JavaScript enabled to view it. or This email address is being protected from spambots. You need JavaScript enabled to view it.