Phase II – Bariatric Diet

Sugar-Free, Carbonation-Free, Caffeine-Free, Clear Liquids and Protein Shakes

Phase II bariatric diet may begin while you are in the hospital if you have tolerated a Phase I Bariatric Diet.  You should stay on the Phase II Bariatric Diet until 2 weeks after surgery.

Types of foods/liquids permitted:

  • Any protein shake that contains at least 20 grams of protein per serving and less than 5 grams of sugar (see “Protein Shakes, Powders & Drinks”)
  • The preferable protein source should be whey protein.  Soy based, egg based or a combination of whey, soy or egg may be used.
  • Collagen-based protein sources should be avoided.
  • You may use water, skim milk or 1% milk to mix powder-based protein shakes.
    • Recommend using lactose-free milk at first.

Types of foods/liquids NOT permitted:

  • No solid foods
  • No caffeinated beverages
  • No carbonated beverages
  • No alcoholic beverages
  • No juice with >5g of sugar
  • No vitamin or mineral supplementation

Important Nutritional Considerations

  • Try to drink 4 – 8 ounces (1/2 to 1 cup) of protein shake 3 times per day (breakfast, lunch and dinner – do not skip these meals)
  • The goal is to consume at least 60 grams of liquid protein per day (high protein shakes)
  • Do not use milk as a substitute for protein shakes (it does not provide enough protein per serving).  You can mix protein powder with milk to make a protein shake.
  • Drink sugar-free, carbonation-free, caffeine-free, clear liquids in between meals
    • Try to consume a total of 64 ounces (8 cups) of fluid per day (this includes any sugar-free, non-carbonated, decaffeinated clear liquids and protein shakes)

Important Reminders

  • “30-Minute Rule”:  Do not drink any clear liquids 30 minutes before or after consuming the protein shake
  • Always check your tolerance level and stop drinking when full
  • Avoid extreme temperatures (extreme cold or hot)
  • Remember to sip slowly, do not gulp, do not use a straw
  • Always remember to keep increasing physical activity as tolerated (as directed by physician)

Sample of a Phase II Bariatric Diet Menu

Morning Decaffeinated coffee with Splenda® (without cream/sugar)
Breakfast Whey protein mixed with 8 oz of skim milk (lactose free)
Mid-morning 8 oz Crystal Light®
Lunch Whey protein mixed with 8 oz of skim milk (lactose free)
Mid-afternoon 8 oz low sodium chicken broth
Dinner Whey protein mixed with 8 oz of skim milk (lactose free)
Evening 8 oz Crystal Light®


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