• December 7, 2020
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Diet Guidelines for Post Bariatric Surgery

The success of your gastric sleeve surgery will depend on your ability to stick to a healthy diet and lifestyle.

Week 1 Post Operation

Duration: This stage will start when you are in the hospital and lasts 5 – 7 days (up to 14 days)

Recommended Intake: Clear liquid intake goal is 64 ounces (2 Liters). Minimum of 48 fluid ounces (1.5 Liters) per day. (Clear broths/bouillon/chicken/beef/vegetable).

Clear liquids can include:

  • Water
  • De-caffeinated coffee or tea including herbal, fruit, and green.
  • Clear broth such as chicken, beef or vegetable..
  • Diluted fruit juice such as apple, grape or cranberry.
  • Diluted sugar-free squash.
  • Sugar free drinks, flavoured water.

What you should avoid:

  • Caffeine – may contribute to acid reflux and dehydration.
  • Sugary drinks – may result in nausea, fatigue, diarrhoea, and even vomiting. Sugar is also full of empty calories.
  • Carbonated drinks – may contribute to gas and bloating.
  • Milk or dairy products.

Week 2-3 Post Operation

During the second week after your sleeve surgery, you will continue to drink plenty of clear fluids whilst also incorporating into your diet fuller liquids that are rich in protein. Your appetite may increase but your digestive system is not yet ready to handle solids. You should fill up on a variety of nutritional liquids.

Full liquid choices in addition to your clear liquids include:

  • Low fat, lactose free milk. Milk can be flavoured with a low-calorie hot chocolate.
  • Homemade smoothies.( up to 2 cups)
  • Slimming drinks and shakes.
  • Yogurt drinks.
  • Sugar-free, non-fat plain Greek yogurt, frozen yogurt.
  • Sorbet
  • Plant Based Milk ( Soy or Almond  or coconut) .
  • Protein Powders
  • Natural Apple Sauce
  • Vegetable juices
  • Hot cereals like oatmeal/ cream of wheat
  • Sugar-Free Pudding
  • Soups (chose higher protein soups like bean soup, chunky soups needs to be blend before eating).

Additional foods to avoid include:

  • Sugary foods.
  • High-fat foods such as whole-milk yogurt.
  • Food that has any lumps.
  • Avoid all carbonated beverages (fills the stomach with gas), sugar (extra calories that fight against weight loss) and coffee (it is acidic and may have problems with acid reflux after surgery. It is also a diuretic, causing you to be dehydrated)


  • 1 oz. packet high protein oatmeal made with almond milk
  • One scoop unflavored protein isolate added in


  • Protein shake (minimum of 20 grams of protein) – clear or thick shake


  • 4 oz. Greek-style yogurt blended with almond milk (chose a yogurt that has more protein than sugar)


  • Clear or thick liquid protein shake


  • Pureed soup


  • Sugar-free pudding with one scoop protein powder blended with almond milk

Week 4-5 Post Operation

  • It is important to only eat until you feel satisfied and no more!
  • to eat a high protein, low sugar, diet.
  • Never eat and drink at the same time.
  • Never eat more than 4 ounces of food at once.
  • Chew your food thoroughly.
  • Aim for 800 calories daily.
  • Never eat before bed

You need to ensure you eat 60 grams of protein each day so include protein in each meal. You can try adding milk when you blend your foods, ensuring that it is free of lumps and a yoghurt like texture.

You may find it tough at this time. Try to eat small portions slowly. Re-introduce new foods slowly, giving your body time to react to each new food so that you can identify any foods that are disagreeable and cause gas, stomach upset, or diarrhoea.

Pureed foods can include:

  • Mashed fruit – bananas, avocados, and canned fruit. Be careful of their sugar content.
  • Blended steamed fish in a low-fat sauce.
  • Canned tuna and salmon
  • Mashed sweet potato.
  • Hummus.
  • Low-fat cottage cheese and soft cheeses.
  • Liquidised meat or fish stew.
  • Liquidised steamed or boiled vegetables.
  • Thick blended soups.
  • Scrambled eggs.
  • Ground chicken or beef.
  • Cottage Cheese
  • Tofu
  • Veggies( Mashed, canned, and slow cooked to tenderize)
  • Greek Yoghurt

Additional foods to avoid include:

  • Food high in starch such as pasta, rice and bread.
  • Tough, raw vegetables such as broccoli, asparagus, celery, and leafy greens.
  • Skin and seeds from vegetables and fruits.
  • Fatty foods including oils and butter.
  • Spicy food.


2 scrambled eggs & 1 oz. string cheese (3 oz.)


Protein shake


3 oz. Chicken salad

  • blended avocado


  • cottage cheese
  • 1 oz. fruit blended in


  • A protein shake or pudding with protein combined in (if hungry)