Gastric Bypass Surgery Post-Operative Diet
After patients undergo gastric bypass surgery, patients will be required to follow their surgeon’s post-operative diet to minimize potential nutritional side effects and complications. Following the post-op diet is crucial to a patient’s success.
The average gastric bypass patient will typically lose 5-15 pounds per week for the first 2 or 3 months, patients will then gradually taper down to 1-2 pounds per week after the first six months. If patients stop losing weight or reach a plateau, patients should re-focus on following the diet or starting at phase 1. Always consult your dietician or nutritionist before making any changes to your post-operative diet.
There are four important nutrition goals for gastric bypass surgery patients to keep in mind. When becoming acclimated to your new diet, make sure you are taking in enough protein as it helps reduce the loss of lean body mass and promotes healing in the body. Patients must also learn how to eat properly for their new stomach size.
Weight loss should always occur in a safe and healthy way through a healthy diet and regular meals at healthy portion sizes. It is also important to consume enough fluids in between meals to promote hydration, which also helps weight loss. Lastly, consuming the proper vitamins and minerals will reduce the risk of deficiency in the body.
Post-Op Vitamins, Nutrients, and Medication Requirements
Vitamins and Supplements: Patients will be necessary to take multivitamins for the rest of their life. Experts suggest taking 2 Multi-Vitamins each day, a B12 sublingual daily (under the tongue), iron, 400 IUs of Vitamin D daily and 2,000 mg Calcium Citrate daily. We do sell our own line of specialized Bariatric Surgery Post-Op Vitamins.
Acid-blocking medication: Patients are required to take this medication for three months after surgery to lower the risk of stomach and bowel ulcers.
Medications to Avoid: Patients most avoid aspirin, ibuprofen, and any NSAIDs (non-steroidal anti-inflammatory). Patients will need to discuss every medication and supplement they take with their physician. Learn more about medications to avoid.
Stages of Post-Op Gastric Bypass Diet
- Phase 1 – Clear Liquids Diet
- Phase 2 – Thick Liquids Diet
- Phase 3 – Soft Foods Diet
- Phase 4 – Regular Foods Diet
Phase 1 Diet – Clear Liquids
Patients will need to consume roughly 4 ounces per waking hour. It’s also important to remember not to use straws as they increase the amount of gas and will make you feel uncomfortable. Patients will be in this phase for as long as their surgeon recommends (usually a week).
- Clear Broth
- Diet Jello
- Sugar-Free Juice
Your goal is to have at least 64 ounces of clear. sugar-fee liquids each day. Choose healthy drinks that will not cause you side effects, so avoid coffee or caffeinated drinks, or carbonated beverages. Drink beverages in small sips and never more than 4 ounces at one time. If the weather is hot or humid, increase your fluid intake to deter dehydration.
Learn More: Phase One: The Bariatric Surgery Clear Liquid Diet
Phase 2 Diet – Thick Liquids
This stage will include fuller liquids that are rich in calories.
- Fat-Free Cream Soup
- Cream of Wheat
- Sugar-Free Plain Yogurt (no fruit, no nuts)
During this phase, the patient will begin to transition from clear liquids to soft foods (phase 3). During this stage, you should focus on having enough protein while still taking in at least 64 ounces. Aim for 60-70 grams a day or 75-80 if you are a male.
It is important to have a protein supplement daily during this phase. Choose a low-carb option with less than 150 calories and at least 15 protein grams. Some good choices are 100% Whey Protein Isolate Bullets or Body Fortress® 100% Whey Protein Powder.
NOTE: If you are lactose intolerant, you may substitute rice or soy milk for cow’s milk.
Learn More: Phase Two: The Bariatric Surgery Thick Liquid Diet
Phase 3 Diet – Soft Foods
This stage will incorporate soft foods into your diet and will last roughly 4-6 weeks, depending on your nutritionist’s instructions. This phase will focus on eating at least 60 grams protein and consuming 550-700 calories per day. Aim for less than 40 grams of carbohydrates each day and less than 30 grams of fat.
Make sure to avoid any red meat, Turkey, Chicken, Veal, bananas, pureed melons, or overcooked vegetables.
- Cottage cheese
- Egg whites beaters or scrambled eggs
- Tofu products
- Ricotta cheese
- Soft cheeses (low-fat options)
- Soft, flaky fish
- Tuna (can have low-fat mayo)
- Ground meats
- 1% Milk Pudding
- Fruit, mashed
- Veggies, Mashed
Eat several times a day. Also, depending on your activity level, include a shake in your meal rotation. During this phase, aim for a high protein, low fat, low carb, and low sugar diet. Never drink while you are eating as it makes you full before you consume enough food. Never eat more than 4 ounces of food at one time.
Learn More: Phase Three: The Bariatric Surgery Soft Solid Diet
Phase 4 Diet – Regular Foods
Patients again need to focus on 60 grams of protein per day (men should aim for at least 80 grams per day). This diet will be with patients for life, but again patients should aim for protein, whole grains, fruits, and vegetables.
At this point, your stomach should be ready for solid foods. You should have a good idea of how much food you can eat before you’re full and are well adjusted to your new eating patterns. Avoid eating anything with empty calories that provide you no nutritional value. Each meal should have at least 3 ounces of protein.
Learn More: Phase Four: The Bariatric Surgery Solid Food Diet
Things to Remember:
- Avoid fast foods, junk food, or foods high in sugar or fat.
- Avoid alcohol, soda, fruit juice, or anything high in calories.
- Cut pieces of little meat – about the size of a penny cut in half. Chew each piece individually. This will promote natural digestion and a reduced risk of acid reflux symptoms.
- Do not consume liquids with meals.
- Eat slowly.
- Stop eating when you’re full.
Ultimately, to maintain your weight loss, you must learn how to eat and what to eat to keep losing weight. Always eat slowly and think hard before consuming something. Think about what this contains and what will it do for my body. Weight loss surgery is the beginning of a new lifestyle to eat healthily and to live an active life.
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