A new research conducted by the UT Southwestern Medical Center investigators have suggested that gastric bypass surgery can alter patients' urine composition that may boost their risk of developing kidney stones.

The study published in the March issue of The Journal of Urology, discovered that some of these urinary alterations render weight-loss surgery patients at high susceptibility for developing kidney stones compared to obese patients who do not undergo the procedure.

The study involved urine samples accumulated from 38 study participants, which were segregated in two groups each having 16 women and three men.

One group reportedly underwent Roux-en-Y gastric bypass (RYGB) surgery, while, the second group contained normal obese individuals.

RYGB, a commonly performed weight-loss procedures, involves the formation of a small gastric pouch and allows food to bypass part of the small intestine.

The study revealed that the excretion of a material called oxalate in urine was very high in the participants who had the surgical procedure compared to those who did not (47 per cent, compared with 10.5 per cent, respectively).