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Pre-Op Weight Loss Surgery Prep: Some Heavy Stuff



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Once you choose your surgeon, you should be confident that you’re in good hands. Still, your surgeon is only partly responsible for your weight loss surgery success. YOU have the greatest share of responsibility. Here’s what you can do before surgery to make surgery safer, make recovery easier, and lose weight faster – and it’s not just sitting back and waiting for your surgery date to arrive!



Pre-Op Diet

The pre-op diet has a few purposes. The critical one is to shrink your liver so it’s not blocking your surgeon’s view of your insides during surgery. That makes your operation easier and safer.

The pre-op diet also helps you lose weight. That may be surprising since you’re expecting to start your weight loss after surgery, but it’s actually a good idea to start losing weight beforehand. In fact, the more you lose before surgery, the safer surgery will be, and the better you’ll feel afterwards.

Different surgeons suggest different pre-op diets. The diet has about 1,000 calories. It could depend on lean Proteins and other nutrient-rich foods, or it could be a liquid diet with Protein Shakes. Or, it could be a combination of the two, with each day including two Protein shakes as Meal Replacements plus one meal with vegetables and protein.

The pre-op diet can last from a few days to several weeks or even months. In general, the longer you’re on it, the better. You’ll lose more weight, shrink your liver more, and gain confidence that you’ll be able to continue a strict eating program long-term after surgery.

Get in Shape

Why exercise before surgery? One reason is that, like with a good diet, it can make surgery safer. In this case, it’s because exercising can strengthen your heart, lungs, and blood vessels. Of course, exercise also burns calories and can help you lose a little extra weight before surgery.

Another reason to get in shape before surgery is because it will make recovery easier. Many weight loss surgery patients find that walking around the house and then the neighborhood is their best tool for fighting post-op pain. If you’re used to being active before surgery, you’ll have an easier time walking after surgery.

You don’t need to go crazy on your pre-op exercise regimen. If you’re not used to exercising, start small. As long as your doctor approves you to be active, just find a few minutes each day to walk at a comfortable pace.

Clean and Stock the Kitchen

Fact: you can’t eat food that’s not there.

So, clean out your kitchen. Get rid of sugary Desserts, starchy Snacks, and fatty meats and cheeses. Anything you know you shouldn’t be eating shouldn’t be in your kitchen. Get rid of it before surgery because for weeks after surgery, you won’t be physically able to carry out heavy trash bags filled with forbidden foods.

Once your kitchen is cleaned out, stock it up! At least get the protein shakes and powders you’ll need for weeks or more after surgery. Consider getting some flavored water in case you’re unable to tolerate Water post-op. You can also stock up on non-perishable staples, such as canned chicken and tuna, frozen fruit and vegetables, and instant oatmeal packets.

Take Your Nutritional Supplements

You know you’ll be taking nutritional supplements post-op. If you have the sleeve or bypass, you’ll be taking them for life. With the band, you’ll need supplements for months, years, or life. Did you know you shouldn’t wait until after surgery to start taking your supplements?

At a minimum, take a Multivitamin beginning when you start your pre-op diet. Even if you’re eating a balanced diet, the supplement helps make sure your body has the nutrients it needs to heal your surgery wound. Also, it’s an insurance policy so that if you have trouble eating and swallowing supplements for a few weeks after surgery, your body will still have a good store of nutrients in reserve.

Practice Your Healthy Eating Habits

Consider the pre-op period practice for the post-op diet. That includes eating slowly, measuring portions, and choosing nutrient-dense instead of processed, high-calorie foods. Also consider making exercise a habit now, so it’s easier to get back to it after surgery.

You cannot guarantee an easy surgery, but you can certainly do a few things to improve your chances. Use these tips to take control of your pre-op prep as soon as you’re ready to lose weight and get healthy!

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Good info

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Great article Alex. I am currently on Day 5 of my Pre-Op diet and all of this information has been very helpful!

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    • LeighaTR

      I am new here today... and only two weeks out from my sleeve surgery on the 23rd. I am amazed I have kept my calories down to 467 today so far... that leaves me almost 750 left for dinner and maybe a snack. This is going to be tough for two weeks... but I have to believe I can do it!
      · 0 replies
      1. This update has no replies.
    • Doughgurl

      Hey everyone. I'm new here so I thought I should introduce myself. I am 53y/o and am scheduled for Gastric Bypass on June 25th, 2025. I'm located in San Antonio, Texas. I will be having my surgery in Tiajuana Mexico. I've wanted this for years, but I always had insurance where bariatric procedures were excluded. Finally I am able to afford to pay out of pocket.  I can't wait to get started, and I hope I'm prepared for the initial period of "hell". I know what I have signed up for, but I'm sure the good to come will out way the temporary period of discomfort and feelings of regret. I'd love to find people to talk to who have been through the same procedure or experience before. So I look forward to meeting you all. Hope you have a great week!
      · 0 replies
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    • Alisa_S

      On day 4 of the 2 week liquid pre-op diet. Surgery scheduled for June 11th.
      Soooo I am coming to a realization
      of something and I'm not sure what to do about it. For years the only thing I've enjoyed is eating. We rarely do anything or go anywhere and if we do it always includes food. Family comes over? Big family dinner! Go camping? Food! Take a short ride or trip? Food! Holiday? Food! Go out of town for a Dr appointment? Food! When we go to a new town we don't look for any attractions, we look for restaurants we haven't been to. Heck, I look forward to getting off work because that means it's almost supper time. Now that I'm drinking these pre-op shakes for breakfast, lunch, and supper I have nothing to look forward to.  And once I have surgery on June 11th it'll be more of the same shakes. Even after pureed stage, soft food stage, and finally regular food stage, it's going to be a drastic change for the rest of my life. I'm giving up the one thing that really brings me joy. Eating. How do you cope with that? What do you do to fill that void? Wow. Now I'm sad.
      · 1 reply
      1. LeighaTR

        I hope your surgery on Wednesday goes well. You will be able to do all sorts of new things as you find your new normal after surgery. I don't know this from experience yet, but I am seeing a lot of positive things from people who have had it done. Best of luck!

    • Alisa_S

      On day 4 of the 2 week liquid pre-op diet. Surgery scheduled for June 11th.
      Soooo I am coming to a realization
      of something and I'm not sure what to do about it. For years the only thing I've enjoyed is eating. We rarely do anything or go anywhere and if we do it always includes food. Family comes over? Big family dinner! Go camping? Food! Take a short ride or trip? Food! Holiday? Food! Go out of town for a Dr appointment? Food! When we go to a new town we don't look for any attractions, we look for restaurants we haven't been to. Heck, I look forward to getting off work because that means it's almost supper time. Now that I'm drinking these pre-op shakes for breakfast, lunch, and supper I have nothing to look forward to.  And once I have surgery on June 11th it'll be more of the same shakes. Even after pureed stage, soft food stage, and finally regular food stage, it's going to be a drastic change for the rest of my life. I'm giving up the one thing that really brings me joy. Eating. How do you cope with that? What do you do to fill that void? Wow. Now I'm sad.
      · 1 reply
      1. summerseeker

        Life as a big person had limited my life to what I knew I could manage to do each day. That was eat. I hadn't anything else to look forward to. So my eating choices were the best I could dream up. I planned the cooking in managable lots in my head and filled my day with and around it.

        Now I have a whole new big, bigger, biggest, best days ever. I am out there with those skinny people doing stuff i could never have dreamt of. Food is now an after thought. It doesn't consume my day. I still enjoy the good home cooked food but I eat smaller portions. I leave food on my plate when I am full. I can no longer hear my mother's voice saying eat it all up, ther are starving children in Africa who would want that!

        I still cook for family feasts, I love cooking. I still do holidays but I have changed from the All inclusive drinking and eating everything everyday kind to Self catering accommodation. This gives me the choice of cooking or eating out as I choose. I rarely drink anymore as I usually travel alone now and I feel I need to keep aware of my surroundings.

        I don't know at what point my life expanded, was it when I lost 100 pounds? Was it when I left my walking stick at home ? Was it when I said yes to an outing instead of finding an excuse to stay home ? i look back at my last five years and wonder how loosing weight has made such a difference. Be ready to amaze yourself.

        BTW, the liquid diet sucks, one more day and you are over the worst. You can do it.

    • CaseyP1011

      Officially here for a long time, not just a good time💪
      · 0 replies
      1. This update has no replies.
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