The most common types of bariatric procedures are surgical procedures that help patients with obesity lose weight by limiting the amount of food they can eat or by decreasing the absorption of nutrients from the food they eat. The most common types of bariatric procedures are:

1. Gastric Bypass: Gastric bypass surgery involves creating a small pouch at the top of the stomach and attaching it directly to the small intestine. This reduces the amount of food the stomach can hold, which helps patients feel full faster and lose weight.
2. Gastric banding: This procedure involves placing a band around the upper part of the stomach, creating a small pouch that limits the amount of food the stomach can hold. Depending on the patient's needs, the band can be adjusted to allow more or less food.
3. Sleeve gastrectomy: This procedure involves removing a large portion of the stomach, leaving a small, tube-shaped stomach about the size of a banana. This helps patients feel full faster and reduces the amount of food they can eat.
4. Biliopancreatic diversion with duodenal switch: This procedure involves removing a large portion of the stomach and attaching the remaining portion directly to the small intestine. It also bypasses a portion of the small intestine, which reduces the number of nutrients the body absorbs from food.
5. Gastric balloon: This procedure involves placing a balloon in the stomach filled with saline or air. The balloon takes up space in the stomach, helping patients feel full faster and eat less.

All of these procedures are major surgeries that carry risks and complications. They are typically only recommended for patients who are severely obese and have not been able to lose weight through other means. It is essential for patients to carefully consider the potential risks and benefits of each procedure before deciding which one is right for them.