Log in Page Discussion History Go to the site toolbox

Gastric Bypass Diet

From BluWiki

What is Gastric Bypass Surgery

The gastric bypass diet is a necessity for people who have had gastric bypass surgery.

If you have not had the surgery, or are not a candidate for the surgery, you can still follow this diet although it will take some discipline and determination to adhere to for any amount of time.

There are four phases to the diet with increasing variety of foods with each phase.

Commitment to the gastric bypass diet includes making a lifestyle change leading to a healthier, happier, thinner you with the energy to do things with your family you never had before.

Is the Diet Right for You?

Who needs to follow the gastric bypass diet? The gastric bypass diet was created for people who have had gastric bypass surgery. You will be working with your physician and a registered dietician to determine which foods are best suited for you. If you have had gastric bypass surgery you will need to follow the diet for your life.

Strict adherence to the diet will ensure you avoid complications such as vomiting, dumping syndrome and weight gain following the surgery. If you do not meet the criteria for gastric bypass surgery or are just interested in losing weight safely you can also follow the gastric bypass diet.

Remember this diet greatly reduces the amount of food you eat and may be difficult to adhere to for any length of time. With some determination and will power you will find that the longer you follow this diet, the easier it gets.

Does the Diet Work?

Why should I follow the gastric bypass diet? There are numerous reasons for following the gastric bypass diet. If you are a post surgery patient it will be required for you to follow this diet. This diet consists of four phases starting with a small amount of food which allows your incisions time to heal. The gastric bypass diet gets you accustomed to consuming smaller amounts of food which benefits you by allowing safe and comfortable digestion without experiencing dumping. The gastric bypass diet assists you in losing weight immediately and prevents you from gaining weight back over the long term.


According to MayoClinic.com the gastric bypass diet consists of four phases. It normally takes someone several month to progress through all the phases and return to a normal diet after surgery. There are several websites which list variations of the gastric bypass diet. The phases listed here are taken from MayoClinic.com.

Phase 1: This phase of the gastric bypass diet consists of all liquids.

Doing the Diet

For the first two days following surgery you will not be allowed to eat or drink anything, to give your incisions time to begin healing. After the second day of fasting you will be started on a clear liquid or full liquid diet. Normally this will be started when you are still in the hospital, depending on when you are released. Some types of gastric bypass surgery are done on an outpatient basis which means you will start your meals at home. On the third day after surgery you will be given an initial diet of liquids at room temperature.

The initial amount you will be given will be between one and three ounces (imagine a medicine cup – this is one ounce). You will be closely monitored in order to ensure you don’t have problems keeping the food down. You may find it amazing that only one or two ounces of liquid makes you feel full!

Foods for Phase 1:

  • Sugar free juices
  • Broth
  • Creamy broth and soups that have been strained to remove all chunks
  • Milk
  • Sugar Free Jello

How long will I be on Phase 1?

You may only have to be in Phase 1 of the gastric bypass diet for several days although the length of time is ultimately a decision that needs to be made by your physician and/or registered dietician.

Phase 2 of the Gastric Bypass Diet

Phase 2 of the gastric bypass diet begins as soon as you are able to keep the liquid foods down for several days and your physician has determined it is safe for you to progress to this phase. This phase consists of pureed foods or foods that have a pasty or thick liquid consistency.

Phase 2 of the gastric bypass diet is normally the phase you will be on when you return home from the hospital after surgery. The phase 2 foods can be prepared at home but you have to remember to choose foods that are easy to blend completely in the blender or food processor.

Foods for Phase 2:

  • Lean ground meat
  • Beans
  • Fish
  • Egg Whites
  • Yogurt
  • Soft Fruits
  • Soft Vegetables
  • Puddings
  • Water
  • Sugar Free Juices
  • Milk
  • Broth
  • Fat free gravy

Phase 2 may not be the time to add spicy foods. Some people may not be able to tolerate dairy products in phase 2. Use caution when attempting to consume spicy food or dairy products.

How long will I be on Phase 2?

You can expect to be in phase 2 of the gastric bypass diet for at least 2 to 4 weeks. As with phase 1 you should not progress to the next phase until your physician or registered dietician permits you to do so.

Gastric Bypass Phase 3

Phase 3 introduces solid foods that are soft. The trick to eating in phase 3 is finding foods that are soft enough to smash with a fork.

Foods for Phase 3:

  • Soft meats
  • Ground meats
  • Finely chopped meats
  • Canned fruits
  • Canned vegetables
  • Soft Fruits
  • Soft Vegetables
  • Cooked Vegetables

As you are adding new foods from phase 3 into your diet it is important to add them one at a time.

This has a twofold benefit; it allows you to determine whether or not you have intolerance to a new food and it gives your body time to learn how to process these new foods.

How long will I be in Phase 3?

Although the amount of time it takes to move from phase to phase varies with each person, the amount of time you should expect to be in phase 3 ranges from 6 to 10 weeks.

Phase 4 of the Gastric Bypass Diet

The last phase in the gastric bypass diet is phase 4. In this phase you will be adding foods that are firmer and with more texture than in the previous phase. You will no longer need to puree food. Although you will be eating firmer foods you should still avoid crunchy foods at first.

Foods for Phase 4

Because you are going to be eating virtually any foods in phase 4 the list of foods would be too great to list here. Instead here is a list of foods you should avoid.

  • Nuts and seeds
  • Popcorn
  • Dried fruits
  • Carbonated beverages
  • Granola
  • Stringy vegetables such as celery, squash
  • Gas producing vegetables including broccoli and cabbage
  • Corn
  • Meats that contain gristle
  • Bread

How long will I be on Phase 4?

In order to maintain your weight and not gain weight back you will be in phase 4 for the remainder of your life. You will be able to add certain foods, one at a time, back into your diet and eventually adopt a plan that works with your lifestyle.

Sample meal plan for one day in phase 4 – courtesy of the West Shore Endoscopy Center at endowsec.com:

Breakfast: ¼ medium banana, 1 scrambled egg, ½ piece white toast and 1tsp margarine Snack: 2 graham crackers, ½ cup sugar free, fat free pudding made with 2% milk

Lunch: 2oz broiled chicken breast, ¼ cup cooked carrots, 1 tsp margarine, ¼ cup pasta salad

Snack: 1 ½ cups fruit cocktail packed in water

Dinner: 2 oz baked fish, ¼ cup green beans, ½ dinner roll Snack: 1 oz American cheese, 2 saltine crackers, 1 tsp mustard

Drink milk throughout the day, but not with meals. Consume 2 or 3 ounces at a time for a total of 2 cups daily.

This sample menu for the gastric bypass diet has 1011 calories, 37 grams of fat, 71 grams of protein, 1065 mg of calcium, 6 mg of iron and 97 grams of carbohydrates.

Changes for the Rest of Your Life

Lifetime modifications for the gastric bypass diet:

Never consume liquids with your meals. This is because you are now eating much less food and adding liquids will only make you feel full sooner. You won’t eat as much and may deprive your body of the vitamins and minerals you need.

Take all vitamin and mineral supplements as your doctor prescribes. Sometimes you will not be able to get enough nutrients from your food. In this case it is important to supplement your diet with vitamins.

Here are some tips on how post-gastric diet goes:

If your doctor suggests you take a multivitamin daily and you are unable to tolerate the vitamin, try eating two children’s chewable vitamins instead. A multivitamin with iron is important because iron assists the cells that carry oxygen to the organs in your body.

Enjoy Your Food Slowly

Eat and drink slowly. This is especially important throughout your life because you may have some very unpleasant experiences when eating or drinking too quickly such as vomiting, bloating or dumping syndrome. Also by eating slowly you are allowing time for the stomach to send a signal to your brain when it is full and you will avoid overeating.

Chew Your Food Well

It’s necessary to chew each bite of food well because the opening to your small intestine is new, and smaller, than it was prior to surgery. Not chewing your food well can cause a blockage in the new opening of the small intestine which means more surgery.

Try new foods one at a time in order to determine your tolerance to them. Trying too many new foods at once can shock your digestive system and cause unpleasant discomfort, nausea, vomiting or dumping syndrome.

Pick the Right Foods

Consume foods that are high in protein. Protein aids you in the healing process. When you are healed, protein will be your main source of energy. This is a lifelong change. Eat foods that are low in fat and sugar. Consuming high fat, high sugar foods can cause dumping syndrome. It can also lead to weight gain.

Gastric Bypass Complications

Common complications of gastric bypass surgery that can be minimized by the gastric bypass diet: Nausea and vomiting – these are the most common effects of people following gastric bypass surgery. Consuming foods in too large of an amount or too quickly can very easily lead to nausea and vomiting.

As you are moving through the phases you can become nauseated when a new food or texture is introduced. You may not tolerate a certain food after the surgery and find that you experience vomiting whenever you consume it. Dehydration – the stomach is a fraction of the size it was prior to surgery.

You can only consume a few ounces of liquid at a time before the stomach stretches and pushes the liquid back up or down. Either way you experience unwanted effects: vomiting or dumping. By consuming sips of liquid throughout the entire day you can ensure you will stay hydrated.

Signals of Problems

If you are vomiting or dumping it is very important to make sure you stay hydrated. Dumping syndrome happens when the amount of food you consume is too large for your new stomach. The food is pushed down into the small intestine prematurely and irritates the bowels. This causes diarrhea, sweating, rupture of your new stomach and can cause hemorrhage, which is life threatening.

Adhering to the gastric bypass diet takes a commitment to a new lifestyle. With some effort and support you can stick with this diet and find the healthier, thinner, happier you that has been waiting to say “hi” to the world.

Site Toolbox:

Personal tools
GNU Free Documentation License 1.2
This page was last modified on 3 August 2013, at 18:45.
Disclaimers - About BluWiki