Recently I stumbled on an advertisement for Tufts Weight and Wellness center. What surprised me is that the ad was mainly promoting surgical weight loss over losing weight the old fashion way. A video on the page makes bariatric surgery appear rather trivial. Because of new technology, patients will be home in 24 hours.
It's hard to say if they are just being realistic that their non-surgical weight loss interventions generally don't work, or if they make more money with surgery. In any case their dietary advice is very outdated.
How did we get to a place where bariatric surgery competes with diet plans? For most obese people, I would recommend trying intermittent fasting and a low-carb diet before surgery.