Post-Op Phase 1

Sleeve Gastrectomy/Gastric Bypass
Post-Op Phase 1 – Full Liquids – Day 1-21

When to Start Stage 1

You will need to start this diet the day you come home from the hospital. The first three weeks postoperatively are crucial for minimizing complications and maximizing your recovery. Adherence to the postoperative diet will set you off on the right foot for your weight loss journey to come as well as give you protection against a potential leak along the staple line of your new, smaller stomach. Following a full liquid diet for the first 3 weeks after surgery will give your body time to heal. This diet will also help you begin to understand how much food you can eat BEFORE you feel too full. This is a time of learning new behaviors and developing new lifestyle habits. The main 3 goals during this phase of the diet are to: 1) Rest the stomach and allow it time to heal, 2) Stay hydrated by consuming ≥ 64oz fluid per day, and 3) Consume adequate amounts of protein to aid in the healing process. Do not worry about calorie intake at this time as your body will turn to your stored fat to obtain the energy that it needs to function.

  • 1-2 oz. of fluid should be sipped every 10-15 minutes while awake.
  • Try and incorporate unflavored meal replacement protein into all of your liquids so that you can meet your protein needs
  • Consume (sip) at least 4 oz. of liquids every hour.
  • All liquids must be very thin. It must be able to flow through a strainer easily. See examples below:
    • Meal Replacement Shakes - We suggest making your own using unflavored meal replacement powder as this prevents flavor burnout
    • Broth or the liquid part of chicken noodle soup (preferably with added unflavored meal replacement protein)
    • Thinned/Blended and Strained High Protein Low Calorie Creamed Soups (see recipes) - No Cream of Chicken!
    • Sugar Free Popsicles
    • Skim Milk, Sugar Free Almond Milk or Soy Milk
    • Sugar Free noncarbonated liquids
    • Water
    • Sugar free drink mixes (add unflavored meal replacement protein for a protein boost)
    • Decaf tea/coffee *Limit to 16 oz. per day (may use nonfat, sugar free dairy creamer)- Add a scoop of unflavored meal replacement and a few squirts of sugar free Equal Café Creamers Caramel Macchiato to decaf coffee for a refreshing coffee drink
  • Lactose intolerance: If you can’t tolerate milk, you may use Lactaid® fat-free or low-fat milk, Vitamite® or Dairy Ease® milk, Soy milk, or unsweetened almond milk found in the dairy section of your grocery store.
  • You may use a sugar substitute in your coffee or tea.
  • It is normal during the initial post-op time to have little or no appetite. At this time, it is likely for you to take in far less food than you need, but for this limited time, it doesn’t present a big problem. It is important to keep yourself hydrated using low to no calorie liquids and begin using food to teach yourself new habits that will keep you healthy and promote steady weight loss. You should not force yourself to eat.
  • Drink 64 oz. of liquid per day. Try to drink 1-2 oz. of liquids every 10-15 min throughout the day to stay hydrated. Include your protein supplement drinks, which meet both your liquid requirements AND your protein needs.
  • Above all else, find a protein drink that you enjoy. The protein is needed for the healing process as you go through the initial stages of recovery. Protein shakes should have at least 20 grams of protein and be low in carbohydrates and fat. To help our patients ensure adequate protein intake, we are proud to offer premium unflavored meal replacement powder as we find that most patients get tired of drinking the same protein drink for 21 days. The unflavored meal replacement powder is designed to be mixed in a variety of liquids and allows patients to significantly increase the variety of liquids that they can consume on this diet phase. Avoid commercial meal replacement shakes such as Atkins, Slim Fast, Boost or Ensure.

Meal Plan

Below are 2 days of sample menus for the liquid diet. Use as is, or as a template, to help you better understand what your diet will look like during this phase. These menus provide 64oz of fluid and 110 grams of protein. Please make sure and sip the liquids at a rate of 1-2 ounces every 15 minutes.

Day 1 Full Liquid Diet Meal Plan
8:00-9:00am
4oz Caramel Macchiato Decaf Coffee (add ice to chill as desired)
9:00-10:00am
4oz Caramel Macchiato Decaf Coffee (add ice to chill as desired)
10:00-11:00am
11:00am-12:00pm
12:00-1:00pm
4oz Cream of Mushroom Soup (will need to thin with extra 4oz of skim milk and strain before consuming)
1:00-2:00pm
4oz Cream of Mushroom Soup (will need to thin with extra 4oz of skim milk and strain before consuming)
2:00-3:00pm
3:00-4:00pm
4:00-5:00pm
5:00-6:00pm
4oz Broth or High Protein Chicken Noodle Soup (no noodles)
6:00-7:00pm
4oz Broth or High Protein Chicken Noodle Soup (no noodles)
7:00-8:00pm
1 sugar free popsicle
8:00-9:00pm
4oz Easy Banana or Vanilla Shake
9:00-10:00pm
4oz Easy Banana or Vanilla Shake
Day 2 Full Liquid Diet Meal Plan
8:00-9:00am
9:00-9:30am
9:30-10:00am
2oz of water
10:00-11:00am
11:00am-12:00pm
12:00-1:00pm
4oz Cream of Potato Soup (will need to thin with extra 4oz of skim milk and strain before having)
1:00-2:00pm
4oz Cream of Potato Soup (will need to thin with extra 4oz of skim milk and strain before having)
2:00-3:00pm
3:00-4:00pm
4:00-5:00pm
5:00-6:00pm
4oz Broth or High Protein Chicken Noodle Soup (no noodles)
6:00-7:00pm
4oz Broth or High Protein Chicken Noodle Soup (no noodles)
7:00-8:00pm
1 sugar free popsicle
8:00-9:00pm
9:00-10:00pm