Ways to Reduce Calorie Intake
Weight Loss Surgery Information
How Weight Loss Surgery Works, Gastric Bypass Bariatric Surgery - Obesity Treatment

How Weight Loss Surgery Works
Information About Gastrointestinal Surgery
Weight Loss Surgery Information

Calories Information - Calories In Food
Exercise Calorie Burning Advice - Exercise Equipment to Burn Calories


How Weight Loss Surgery Works

How Weight Loss Surgery Works

To understand how gastric bypass surgery helps to reduce obesity, we need to know how we normally digest our food.

Fig 1. The Normal Digestive Process

As food moves along the digestive tract, digestive juices and enzymes digest and absorb calories and nutrients. For example, as we chew and swallow our food, it proceeds downwards along the esophagus to the stomach, where powerful stomach acids continue the digestive process. The stomach can hold about 3 pints of food at one time. As the partially digested stomach contents move to the duodenum, (the first segment of the small intestine), bile and pancreatic juice speed up digestion. Most of the iron and calcium in the foods we eat is absorbed in the duodenum. The jejunum and ileum, the remaining two segments of the nearly 20 feet of small intestine, complete the absorption of almost all calories and nutrients. The food particles that cannot be digested in the small intestine (eg. fiber) are stored in the large intestine until eliminated.

How Does Weight Loss Surgery Promote Weight Control?

Restrictive Weight Loss Surgery
Gastrointestinal weight loss surgery alters the normal digestive process. It closes off parts of the stomach to make it smaller. Operations that only reduce stomach size are known as “restrictive operations” because they restrict the amount of food the stomach can hold.

Malabsorptive Weight Loss Surgery
Some operations combine stomach restriction with a partial bypass of the small intestine. These procedures create a direct connection from the stomach to the lower segment of the small intestine, literally bypassing portions of the digestive tract that absorb calories and nutrients. These are known as malabsorptive operations.

Benefits and Health Risks of Weight Loss Surgery

Malabsorptive operations produce more weight loss than restrictive operations, and are more effective in reversing the health problems associated with severe obesity. Patients who have malabsorptive operations generally lose two-thirds of their excess weight within 2 years. But malabsorptive operations also carry greater risk for nutritional deficiencies. This is because the procedure causes food to bypass the duodenum and jejunum, where most iron and calcium are absorbed. Menstruating women may develop anemia because not enough vitamin B12 and iron are absorbed. Decreased absorption of calcium may also bring on osteoporosis and metabolic bone disease. Patients are required to take nutritional supplements that usually prevent these deficiencies.

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Weight Loss Surgery Information

How Weight Loss Surgery Works - Morbid Obesity - Morbid Obesity Surgery
Treatment of Obesity - Bariatric Surgery Health Risks - Abdominoplasty
Gastric Banding - Gastric Bypass - Mini Gastric Bypass - Gastroplasty
Laparoscopic Gastric Bypass - Roux En Y Gastric Bypass - Lap Band Surgery
Lap Band - Lap Band FAQs - Biliopancreatic Diversion - Duodenal Switch
Liposuction - Liposuction Surgery - Superwet Liposuction - Tumescent
Ultrasonic Liposuction - Tummy Tuck - Mini Tummy Tuck - Stomach Stapling

Dietary Calories In Main Food Groups

Calories in Alcohol - Calories in Bacon/Pork - Calories in Bagels - Calories in Beans - Calories in Beef - Calories in Beer - Calories in Bread - Calories in Breakfast Bars - Calories in Breakfast Cereal - Calories in Butter - Calories in Cakes - Calories in Candy - Calories in Cheese - Calories in Chicken - Calories in Coffee/Creamers - Calories in Condiments - Calories in Cookies - Calories in Croissants - Calories in Deli Meat - Calories in Donuts - Calories in Dressings - Calories in Eggs - Calories in Fast Food - Calories in Fats/Cooking Oils - Calories in Fish/Seafood - Calories in Frozen Entrees - Calories in Fruit - Calories in Game Meat - Calories in Herbs/Spices - Calories in Ice Cream - Calories in Jelly/Jam - Calories in Juice - Calories in Lamb - Calories in Mexican Food - Calories in Muffins - Calories in Milk/Yogurt - Calories in Noodles - Calories in Nuts - Calories in Pancakes - Calories in Pasta - Calories in Pies - Calories in Pizza - Calories in Popcorn - Calories in Potatoes - Calories in Pretzels - Calories in Rice - Calories in Sauces - Calories in Snacks - Calories in Soft Drinks - Calories in Soup - Calories in Soy Food - Calories in Sugar - Calories in Toppings - Calories in Turkey - Calories in Veal - Calories in Vegetables - Calories in Whole Grains - Calories in Wine - Energy in Food - Nutrition in Food

Information About Energy Needs and Calorie Deficit to Lose Weight

Definition of Calorie - Definition of Kilocalories (kcals) - Calorie Needs to Maintain Weight - Calorie Needs for Teens - Calorie Intake per Day - Calorie Intake and Expenditure - Energy Burned by Exercise - Calories in Pound of Body Fat - Weight Loss Diets - Calorie Controlled Weight Loss Diet - Low Calorie Diets - Low Calorie Recipes - Calorie-Counting to Lose Weight - Basal Metabolic Rate - Calories Needed to Lose Weight - How to Reduce Calories - How to Reduce Fat Calories - Weight Loss and Calories

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