Pre-Op Liquid Diet Phase for Gastric Bypass Surgery

Gastric Bypass Preop Diet So I went for my classes yesterday to get me educated and ready for my upcoming surgery. On my next appointment which should be next week with my surgeon I will get an actual surgery date. Usually right after that surgery date they make you go on a 7-10 day liquid diet. The purpose of this liquid diet is to shrink your liver down enough that they do not have to move it around so much during surgery. This is a very important process and one you cannot cheat on. Below is the information I received from my dieitician about the diet please remember what your doctors office tells you may differ this is just a general outline.

  • Drink up to 3-4 Protein shake drinks these drinks need to contain the following: 200 calories or less, 15-25 grams of protein, 10 grams or less of carbs, 5 grams of fat

Then you can have any of the below as they are considered clear liquids:

  • Thin broths like chicken or beef NO veggies or noodles
  • Sugar free jello any flavor or color
  • Sugar free popsicles
  • decaf coffee and tea
  • sugar free and non carbonated drinks like powerade zero, crystal light, propel and more
  • artifical sweetner of choice

Now 48 hours before surgery you STOP drinking protein supplements and only do the clear liquids listed above


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About Angie

Single Mom of two girls on a journey to get healthy by losing weight and learning to love herself again!


  1. Karen Thomas says:

    I didn’t know that the purpose of the diet is actually for the liver; all along I thought it was for the stomach. Thanks for the heads up. Bariatric Eating

  2. Pam Downing says:

    Thank you for providing this information. I started my liquid diet for preop today. I will have surgery January 12. I hope to have a Rouxeny but there is a possibility they may have to do a sleeve. I just discovered your webpage and it has answered a lot of questions. Thanks again Pam

  3. PamDowning says:

    I am three days post surgery. My doctor wants me to crush all my pills, unless they are time released. everyone I have talked to has not heard of this. Do any of you have to do this and if so how do you do it. It is very nasty.

    • YES I had to do this also for the first month and it was awful lol About the only thing I could tolerate was to put them in sugar free cinnamon applesauce. We have two surgeons in our office one makes us crush our vitamins and the other one does not lol Go figure I got the one who makes us crush our pills lol Hope you are starting to feel better Angie

  4. Lourdes (lou) says:

    Thanks for info my surgery is April 10, liquid diet begins April 3rd, tons of questions and emotions ;)&

  5. Juliette says:

    I am starting my 2 week liquid diet today. I am super nervous and excited all at the same time. I am glad to hear there are others out there that have gone through it already, sharing their journey. Thank you!

  6. I have started my liquid diet 2 weeks before my surgery. This is what my surgeon had instructed me. I thought it will be impossible for me because I haven’t done this diet before. But because I needed to do it, I don’t have any choice. And I am happy that I followed my surgeon very well.
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  7. I started my pre op diet this past Monday. Thank you for posting your progress. My date for surgery is April 25.

    • Congradulations I am so happy for you!! Please keep me updated and contact me on Facebook if you have any questions or if I can be of any help!!

  8. Getting nervous started the all liquid diet 30 day to gastic bypass surgery my Dr said the liquid protein 2 weeks before but I figured a few my weeks to get used to it would help

    • That is a great idea!! For me the first three days of the liquid diet were so hard but it all mental. Once you get over that hurdle you start to feel much better both mentally and physically! Please keep me updated on your surgery and your progress and good luck hun!!

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