"Does anyone get refused for gastric bypass surgery? If so, why?"
Yes, there are people who may not meet the criteria for weight loss surgery or be evaluated and turned away. Here are some of the known contraindications to weight loss surgery:
1) Untreated major depression or psychosis may lead someone to get rejected from having a gastric bypass procedure. With most weight loss surgeons part of their multidisciplinary team will be a therapist who will evaluate your readiness prior to approval for the procedure.
2) Binge eating disorders are not an absolute contraindication but you will need to show resolution of that issue prior to approval for the gastric bypass procedures.
3) Current drug and alcohol abuse.
4) Severe cardiac disease with major anesthetic risks.
5) Severe coagulopathy (bleeding disorders).
6) An inability to comply with nutritional requirements including life-long vitamin replacement.
7) Gastric bypass surgery in advanced (above 65) or very young age (under 18) is controversial, but can be considered.
8) Generally you must have a body mass index (BMI) greater than 35 to be considered.
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