Tequila, do you really not understand that bariatric surgery (used as a last resort on obese people where other methods of weight loss have failed), is designed to treat their mental health problems?
Of course it isn't. It's to treat the physical problems. This is from the NHS:
Being obese can also increase your risk of developing many potentially serious health conditions, including:
type 2 diabetes
high blood pressure
high cholesterol and atherosclerosis (where fatty deposits narrow your arteries), which can lead to coronary heart disease and stroke
asthma
metabolic syndrome, a combination of diabetes, high blood pressure and obesity
several types of cancer, including bowel cancer, breast cancer and womb cancer
gastro-oesophageal reflux disease (GORD), where stomach acid leaks out of the stomach and into the gullet
gallstones
reduced fertility
osteoarthritis, a condition involving pain and stiffness in your joints
sleep apnoea, a condition that causes interrupted breathing during sleep, which can lead to daytime sleepiness with an increased risk of road traffic accidents, as well as a greater risk of diabetes, high blood pressure and heart disease
liver disease and kidney disease
pregnancy complications, such as gestational diabetes or pre-eclampsia, when a woman experiences a potentially dangerous rise in blood pressure during pregnancy
www.nhs.uk/conditions/obesity/