Very obese older men hoping to live longer may be let down by a new long-term study that found weight-loss surgery didn't increase survival for people like them — at least during the first seven years.
Prior studies have found stomach stapling and other obesity surgeries improved survival rates after two to 10 years. The new study in mostly older male veterans suggests one of two things: Not everyone gains equally from surgery, or a survival benefit may show up later in older men, after more years of follow-up.
Previous findings came mainly from studies of mostly younger women.
"Nearly all prior studies have found bariatric surgery to be associated with reduced mortality. But those studies were conducted on very different patient populations using less rigorous methods," said lead author Matthew Maciejewski of the Veterans Affairs Medical Center in Durham, N.C.
The patients' organ damage from obesity could have been too far along for weight loss surgery to reverse it, some experts said.
U.S. doctors now perform more than 200,000 obesity surgeries a year at an estimated cost of $3 billion to $5 billion.
The new study will appear in Wednesday's Journal of the American Medical Association.