Gastric surgery for weight loss

Gastric surgery for Weight-Loss
In this paper, you will address the following:

What are the main types of gastric surgery used for weight loss?
What are the potential risks or complications of these surgeries?
What percentage of patients regain their weight? How does this occur?
(Minimum length of paper 500 words.)  Papers need to be referenced and follow APA formatting guidelines (see link in course).