Does RNY always involve a malabsorptive component?

I went to an informational session at my surgeon-to-be's office and was described a laparoscopic RNY procedure, that leaves you with a 1/2 ounce pouch (along the greater curvature of the stomach) and NO malabsortption. Is this possible? Doesnt RNY always have some malabsorption (contributing to greater and sustained weight loss). Was the nurse wrong?

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