The practical value of comprehensive stool analysis in detecting the cause of idiopathic chronic diarrhea.

The practical diagnostic value of fecal analysis in the evaluation of patients with chronic nonbloody diarrhea is controversial. It is possible that variations in its value depend on how it is done and how the results are interpreted rather than on its intrinsic value. In the authors' city, stool analysis has been made easily accessible, with a commitment to quality assurance and interpretation.

The contribution of malabsorption to the reduction in net energy absorption after long-limb Roux-en-Y gastric bypass.

Background: Roux-en-Y gastric bypass (RYGB) restricts food intake, and when the Roux limb is elongated to 150 cm, the procedure is believed to induce malabsorption.

Objective: Our objective was to measure total reduction in intestinal absorption of combustible energy after RYGB and the extent to which this was due to restriction of food intake or malabsorption of ingested macronutrients.

Design: Long-limb RYGB was performed in 9 severely obese patients.