(Bloomberg) -- Obese people who have weight-loss surgery gain at least six years of health benefits that include fewer diabetes cases and lower cholesterol and blood pressure. Even so, their medical costs didn’t drop.

While the advantages linked to diminished fat were found to be durable over six years in a study published Tuesday, a second report tied the surgery to complications such as gallstones and anemia that raised how much patients spent over the same time period. The research was included in an obesity theme issue of the Journal of the American Medical Association.

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