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After gastric bypass, the stomach pouch is only about 1 ounce in size. Over time, it will increase to hold approximately 4 to 8 ounces (about ½ - 1 cup). This poses multiple nutrition challenges. Since changes to normal digestion and absorption of micro and macronutrients occur, patients must develop new eating and drinking strategies for optimal weight loss and maintenance of overall health.

Diet Progression - foods are re-introduced slowly after surgery to allow the digestive tract to heal. As swelling decreases, textures should progress from liquids to soft so that foods can pass through the system as easily as possible. Major goals of diet progression include:
• Avoidance of dehydration by drinking plenty of water
• Preservation of lean muscle tissue with adequate nutrient intake, focusing upon proteins
• Prevention of nutrient deficiencies with appropriate vitamin/mineral supplementation
• Avoidance of adverse side effects like nausea, vomiting, “dumping”, discomfort, and pain



For a more complete look at the implications gastric bypass surgery has upon nutrition, click here to download and print our bariatric nutrition guide.


Nutrition after Gastric Bypass FAQ
What are the guidelines for nutrition and fluid goals at various stages after gastric bypass?
Is alcohol safe after gastric bypass surgery?
Is chinese food and pizza okay to have after weight loss surgery?
What should I do if I become lactose intolerant after bariatric surgery?
Will I be able to drink carbonated drinks after gastric bypass surgery?
What about caffeine?
Are artificial sweeteners okay?
Can I gain my weight back?
Is burping throughout the day common?
Is it possible to eat and drink at the same time?
Is there a magic calorie level after bariatric surgery?



General guidelines for nutrition goals at various stages after gastric bypass
Daily Goals
<3 Mos. Post-Op
3-6 Mos. Post-Op
>6 Mos. Post-Op
Fluid 48-64 oz. 48-64 oz. 48-64 oz.
Calories Min. of 800 Kcal ~1200 Kcal Dependent on individual needs
Protein ≥50 g 80-100 g 30-35%
Carbohydrates 90-100 g 135-150 g 45-50%
Fat 18-22 g 27-33 g 20-25%
Fiber ≥ 20 g 20-25 g

<age 50= 25g (women) 38g (men)

>age 50= 14g per 1000 total Kcal

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Is alcohol safe to have after surgery?
It is essential to wait until your intake of solid food is adequate before you consider alcohol consumption in any amount. Alcohol, from a nutritional standpoint, may cause further malabsorption of nutrients, particularly with Vitamin B12, Folic Acid, and Thiamin. An occasional glass of wine should be okay, but alcohol should never be substituted for other more nutritional solid foods or beverages. Some patients report that they will feel the effects of alcohol faster than any other time in their life. You should always consult your physician regarding safe alcohol intake post surgery.
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Is Chinese food and pizza okay?
Each person’s tolerance to these foods is very individual. Some people are lactose intolerant after surgery, so pizza may cause diarrhea. Some people tolerate Chinese food well-especially soups and lean chicken, beef or seafood; However, some don’t tolerate Chinese food because the food is fried and high in fat. All in all, if you do tolerate these foods, make every effort to keep your choices low in fat. Fat can cause stomach discomfort and prevent you from losing more weight. If you are going to eat these foods, try to limit the frequency in your diet or try to prepare them at home.
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What should I do if I become lactose intolerant after surgery?
Persons who become intolerant to the sugar in milk, lactose, may develop symptoms such as bloating, flatulence, cramps, or diarrhea after consuming dairy products. If you are lactose intolerant, try Lactaid ® milk or soy milk. Also some people who are “lactose intolerant” can consume yogurt and aged cheeses without any symptoms. You may find that cereals like Shredded Wheat ® and high sugar cereals like Fruit Loops ® when consumed with milk may have contributed to the discomfort and diarrhea as well. Hot cereal should not be a problem. The important thing to remember is to keep your portions small, especially when you are experimenting with adding new foods. Dairy products provide important nutrients and you should consult a dietitian if you are having difficulty.
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What about carbonated beverages?
You should avoid these beverages as much as possible because the bubbles may cause severe pain, and will enhance burping. Also, soda can be a source of empty calories which can affect weight loss. You will likely miss out on a more nutritious beverage like non fat milk by consuming these high calorie beverages. Soda is also a significant source of caffeine (see below).
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What about caffeine?
Caffeinated beverages such as coffee and tea should be okay in moderation unless you experience reflux; then caffeine can make this condition worse. Too much of anything, including caffeine, can have side effects. Caffeine is a stimulant, and it can interfere with the absorption of some key nutrients.
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Are artificial sweeteners okay?
Saccharin, aspartame, acesulfame K, and sucralose are not real sugars so they do not contribute calories. However be careful with sugar-free foods made with sorbitol, mannitol, and xylitol (artificial sweeteners) because they can cause diarrhea in some people. They are sugar alcohols, found in sugar-free chocolate and hard candies.
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Can I gain my weight back?
Unfortunately, yes! Poor food choices, lack of lifestyle change and exercise seem to be the main reasons. Success and maintenance of weight loss are as much related to you as the surgery itself.
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Is burping throughout the day common?
Yes, this may be due to the fact that you swallow air throughout the day. The air bubbles in your smaller stomach pouch may cause you to feel the need to burp more frequently.
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Is it possible to eat and drink at the same time?
Doing so may cause nausea or vomiting. However, some people are able to do both at the same time and experience no discomfort. To prevent discomfort, sip very small amounts of fluids with meals as tolerated. Wait until you are done eating to begin drinking larger amounts.
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Is there a magic calorie level?
No, there is no specific level. Nutritional needs are very individual. If you find that your weight loss is slowing down, there can be many reasons for this. Diet is always one factor to look at, but the body may actually plateau every so often. See a dietitian to evaluate your current calorie needs.
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