Diet before gastric sleeve surgery; What is the diet before gastric sleeve surgery? What is the liquid diet before gastric sleeve surgery? This process reduces both the risks associated with surgery and facilitates the surgical process, as it reduces the size of the liver. For the preparation of surgery, all routine surgical tests are performed. Respiratory functions are evaluated. In addition, the stomach is evaluated by preoperative endoscopy for possible stomach pathologies. In addition to the relevant examinations, the opinion of the cardiology, endocrinology, chest, psychiatry, and anesthesiologist is taken for the operation. The patient is left hungry one night in advance. The patient is told what to do for the formation of a vascular clot, and blood thinners are started. A gastric sleeve surgery diet is just as important as the surgery.

Gastric sleeve surgery, also known as sleeve gastrectomy, is a surgical procedure that reduces the size of the stomach, helping individuals achieve weight loss goals. Before undergoing this surgery, patients are required to follow a strict diet to prepare their bodies for the procedure. This diet plays a crucial role in shrinking the liver and reducing the risk of complications during and after the surgery.

Diet Before Gastric Sleeve Surgery

Gastric sleeve surgery, also known as sleeve gastrectomy, is a surgical weight-loss procedure in which the stomach is reduced to about 15% of its original size. This smaller stomach size restricts the amount of food that can be consumed, leading to significant weight loss. Before undergoing gastric sleeve surgery, it is crucial to follow a specific diet to prepare your body for the procedure and reduce the risk of complications. In this blog post, we will discuss the importance of a pre-surgery diet, the dietary guidelines to follow, and the potential benefits of adhering to these guidelines.

Why is a Pre-Surgery Diet Important?

A pre-surgery diet is essential for several reasons. Firstly, it helps to reduce the size of the liver. The liver is located near the stomach and can become enlarged in individuals with obesity. An enlarged liver can make the surgical procedure more challenging and increase the risk of complications. By following a pre-surgery diet, you can shrink the size of your liver, making the surgery safer and more manageable for your surgeon.

Additionally, a pre-surgery diet can help you lose some weight before the procedure. Losing weight before surgery can improve surgical outcomes and reduce the risk of post-operative complications. It can also help you get into the habit of making healthier food choices, which will be crucial for long-term success after the surgery.

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    Dietary Guidelines Before Gastric Sleeve Surgery

    Before gastric sleeve surgery, your healthcare team will provide you with specific dietary guidelines to follow. These guidelines are designed to prepare your body for the procedure and minimize the risk of complications. While the exact recommendations may vary depending on your individual health status and the preferences of your healthcare provider, there are some general principles that are commonly followed.

    1. High-Protein, Low-Carb Diet: A high-protein, low-carbohydrate diet is often recommended before gastric sleeve surgery. Protein is essential for preserving muscle mass and supporting healing after surgery. Additionally, reducing carbohydrate intake can help your body burn fat more efficiently, leading to some weight loss before the procedure.

    2. Avoid Sugary and Fatty Foods: Foods high in sugar and fat should be avoided or limited before surgery. These foods can contribute to weight gain and may increase the risk of complications during and after the surgery. Instead, focus on consuming lean proteins, non-starchy vegetables, and healthy fats.

    3. Stay Hydrated: Adequate hydration is crucial before surgery. Aim to drink plenty of water throughout the day to keep your body well-hydrated. Avoid sugary beverages and excessive caffeine, as these can contribute to dehydration.

    4. Vitamins and Supplements: Your healthcare provider may recommend taking specific vitamins and supplements before surgery to ensure that your body is adequately nourished. Common supplements include iron, calcium, vitamin D, and vitamin B12. It is essential to follow your healthcare provider’s recommendations regarding supplementation.

    5. Portion Control: Practice portion control and mindful eating before surgery. This can help you get into the habit of eating smaller meals and prevent overeating after the procedure.

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    What is the Diet Before Gastric Sleeve Surgery?

    The diet before gastric sleeve surgery is designed to prepare the patient’s body for the procedure. It focuses on reducing the size of the liver, as a large liver can make the surgery more challenging and increase the risk of complications. The diet typically involves a low-calorie and low-carbohydrate intake, with an emphasis on consuming lean protein and nutrient-dense foods.

    Phase 1: Pre-Operative Diet

    The pre-operative diet usually starts two to three weeks before the scheduled surgery date. During this phase, patients are advised to consume a calorie-restricted diet to promote weight loss and reduce the size of the liver. The diet typically consists of lean protein sources such as chicken, fish, tofu, and eggs. These protein sources are not only low in calories but also help to preserve muscle mass.

    Additionally, patients are encouraged to eat plenty of non-starchy vegetables, such as broccoli, spinach, and kale, which are rich in essential vitamins and minerals. These vegetables provide the necessary nutrients while keeping the calorie intake low. It is important to avoid high-calorie and high-fat foods, such as fried foods, sugary snacks, and processed foods, during this phase.

    Phase 2: Liquid Diet

    The liquid diet is an essential part of the pre-operative diet before gastric sleeve surgery. It is typically followed for one to two weeks before the surgery. The purpose of the liquid diet is to further reduce the size of the liver and prepare the digestive system for the changes that will occur after the surgery. The liquid diet helps to shrink the liver by eliminating excess glycogen stores and reducing inflammation.

    During this phase, patients are required to consume only clear liquids, such as broth, sugar-free gelatin, and sugar-free popsicles. These clear liquids provide hydration and essential nutrients without straining the digestive system. It is crucial to avoid any solid foods, including fruits and vegetables, during this phase. Patients are also advised to avoid consuming any beverages that contain sugar, caffeine, or carbonation.

    Phase 3: Transition Diet

    The transition diet is the final stage of the pre-operative diet before gastric sleeve surgery. It typically starts a few days before the surgery. The goal of this phase is to gradually reintroduce solid foods while still maintaining a low-calorie and low-carbohydrate intake. This phase helps to prepare the body for the post-operative diet, which will be discussed later in this article.

    During the transition diet, patients can start consuming soft, pureed foods such as yogurt, cottage cheese, and mashed vegetables. It is important to chew food thoroughly and eat slowly to prevent any discomfort or digestive issues. Patients are advised to avoid foods that are high in fat, sugar, and carbohydrates. It is crucial to follow the guidelines provided by the healthcare team to ensure a successful transition into the post-operative phase.

    Gastric Sleeve Diet Plan after the Surgery

    After undergoing gastric sleeve surgery, patients must follow a strict diet plan to promote healing, prevent complications, and achieve long-term weight loss goals. The diet plan is divided into several phases, starting with a clear liquid diet and gradually progressing to solid foods over time. Let’s explore the diet plan after gastric sleeve surgery in more detail.

    Phase 1: Clear Liquid Diet

    The first phase of the post-operative diet is the clear liquid diet, which typically lasts for one to two days after the surgery. During this phase, patients are allowed to consume clear liquids such as water, broth, sugar-free gelatin, and sugar-free popsicles. It is important to stay hydrated and avoid any carbonated beverages, caffeine, and sugary drinks.

    Phase 2: Full Liquid Diet

    The full liquid diet follows the clear liquid diet and usually lasts for one to two weeks after the surgery. During this phase, patients can consume liquids that are not clear, such as milk, protein shakes, pureed soups, and yogurt. It is important to choose liquids that are high in protein and low in sugar to support the healing process and provide essential nutrients.

    Phase 3: Soft Diet

    The soft diet phase is the next step in the post-operative diet plan. It typically starts around two to four weeks after the surgery. During this phase, patients can consume soft, easily digestible foods such as cooked vegetables, soft fruits, scrambled eggs, and ground meats. It is important to chew food thoroughly and eat slowly to prevent any discomfort or digestive issues.

    Phase 4: Regular Diet

    The regular diet phase is the final stage of the post-operative diet plan. It usually starts around four to six weeks after the surgery, depending on the individual’s progress and recommendations from the healthcare team. During this phase, patients can gradually reintroduce solid foods into their diet. It is important to focus on consuming a balanced diet that includes lean protein, whole grains, fruits, vegetables, and healthy fats. Portion control and mindful eating are key factors in maintaining long-term weight loss.

    Gastric Sleeve Diet Plan after the Surgery

    The long-term success of surgery after gastrectomy is very associated with following the recommended diet. Solid food should not be taken for 2 weeks after surgery. The liquid Dida diet should be followed by soft juicy food. A healthy eating plan is very important after surgery. There are two main goals in nutrition after gastric sleeve surgery. Ensuring the necessary nutrient and energy requirements by keeping tissue recovery and lean tissue loss at a minimum level after surgery.

    Ensuring early saturation with selected nutrients, reducing the occurrence of surgical complications such as reflux, dumping syndrome, and ensuring the continuity of weight loss. After surgery, the diet plan consists of 4 stages. 4. Along with the stage, the person goes on a diet that will last for life. According to the person’s tolerance status, the fourth stage is passed within a period of 1-1.5 months.


    Clear liquids are consumed for the first 2 days after surgery. They’ll drink without carbonates, without sugar, without decaf. (Teas such as Linden, rosehip)


    3 after surgery. The day begins and 14. Applicable to the day.

    Total consumption of at least 1.5-2 liters of liquid should be provided daily.

    You can sip 30 ml (2 tablespoons) of liquid every 15 minutes.

    Clear liquids (decaffeinated unsweetened teas, herbal tea)

    Protein-rich enteral products

    Lactose-free milk or soy milk

    Fat-free yogurt, buttermilk

    Unsweetened compote juice

    Drained vegetable juices and soups (spinach, purslane, chard, carrots, potatoes, zucchini)

    Drained juices (apple, peach, banana, grape, apricot juice)

    Full eggs can be added to the soups.

    Protein powders for protein needs


    15 after surgery. The day begins and 35. It goes on until the day.

    1.5 – 2 lt liquid consumption and 60-80 g protein consumption are targeted every day.

    30-60 ml is taken every 30 minutes and 120 ml consumption is attempted within 1-1.5 hours.

    3 main 3 decoctions are planned throughout the day.


    Open tea, Linden, rosehip tea

    Sugar-free and grain-free compote

    Freshly squeezed fruit juices with no sugar added

    Blenderized fruit puree (apple, banana, peach, apricot, melon, watermelon, cherry)

    Mixtures prepared with milk and fruit

    Low-fat/low-fat milk, lactose-free milk, soy milk, and light buttermilk

    Sugar-free pudding and milk desserts

    Low-fat spreadable cheeses, such as cottage cheese, labneh, curd


    Lean red meat in the form of minced meat, chicken, turkey, fish

    Blenderized or drained fat-free and tomato paste soups (rice and vegetable soups with milk / minced meat/chicken, noodle, red lentil soup)

    Recommended vegetable dishes in a diet with a soft consistency

    Softened meat, breadcrumbs, rye, and whole wheat bread

    Whole wheat, rye, oat flour

    Boiled crushed dried legumes

    Thoroughly crushed oilseeds (walnuts, nuts, almonds)


    The continuation diet is applied to ensure the continuation of weight loss. At this stage, food consumption is tried to be provided in portions appropriate to the daily needs of the individual.

    When hunger increases and more nutrients can be tolerated, averaging begins 6 weeks after surgery and continues for life.

    60-90 g of protein intake and 1, 5 -2 liters of liquid consumption should be provided every day.

    100 ml is consumed every 30 minutes and 200 ml is reached within 1-1.5 hours.

    3 in this diet. In addition to the stage, solid foods can be consumed.

    Foods that are forbidden are as follows;

    All sugary, carbonated, alcoholic beverages

    Brewed / dark tea and coffee

    Caffeinated drinks


    Ready-made juices with added sugar

    Gas-producing vegetables (such as cabbage, leeks, and broccoli)

    Dried legumes (can be added to the diet according to tolerance)

    Ready-made soups

    Very hard and fatty meats

    Whole milk products

    Multi-sugar and starchy desserts

    Bouillon tablets


    Fast food

    Salad dressings

    Gastric Sleeve Diet: After the Surgery in 3 Months

    After this operation, 3 Main and 3 decoctions are recommended for patients. Patients can consume all kinds of food, but the biggest difference compared to the preoperative period is that the portions are reduced. If the patient acquires a healthy eating and drinking habit and keeps their portions at the recommended level, they will never experience discomfort.

    Because the risk of leakage after tube stomach surgery is greater than in other operations; patients should only be fed liquid foods for the first two weeks. During the liquid nutrition period, patients are recommended protein-assisted drinks. You must take attention to the calories that you will get.

    Gastric Sleeve Diet: After the Surgery in 6 Months

    After the first month, it is a period of solid nutrition. We’ll start with solid foods gradually. We move forward by adding nutrients according to your digestive status, and by the end of the sixth month, we will have added all nutrients to your list. For certain success after Gastric sleeve surgery, you should follow this gradual diet. It reduces the risk of complications and you lose weight in a healthy way. In the long run, you will gain new habits to lose weight permanently and maintain your weight throughout your life.

    Gastric Sleeve Diet: After the Surgery in 12 Months

    During this period, patients are trained to increase the nutritional value of foods in small portions during breakfast-lunch-dinner and decoctions. Since obesity is very common with the problem of constipation after surgical operations, fiber consumption should be taken together with normal foods. A cheese omelet made with cheese, eggs, or a lean pan for breakfast meals should be preferred for lunch and dinner, such as meat, chicken, fish, vegetables, and dried fruit (without water). In intermediate meals, foods such as milk, buttermilk, fruit yogurt, decoction yogurt, kefir, and fruit with high protein content can be preferred. Do not consume foods such as tomato paste, spices, oil, lemon, acidic fruits such as oranges, tangerines, grapefruit, raw vegetables , salads, or oilseeds that remain in the stomach for a long time, unless your dietitian recommends it.

    Benefits of Following Pre-Surgery Dietary Guidelines

    Adhering to the dietary guidelines before gastric sleeve surgery offers several benefits:

    1. Reduced Surgical Risks: Following a pre-surgery diet can reduce the size of your liver, making the surgical procedure safer and more manageable for your surgeon.

    2. Weight Loss: Many individuals experience some degree of weight loss before surgery by following the dietary guidelines. This can improve surgical outcomes and make the recovery process smoother.

    3. Healthier Habits: By following a pre-surgery diet, you can start developing healthier eating habits that will be crucial for long-term success after the surgery. Learning to make nutritious food choices and practice portion control can set the stage for sustainable weight loss and improved overall health.

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    “Very good before and aftercare. Lots of pre and post op information and support. Team were responsive to any issues that arose and made me feel safe. Each day that I was in hospital the team came to check on me (sometimes 3 times in a day), in addition to the core checks by the nurses. Pre and post op I was put in a WhatsApp group with the surgical team for additional and personal support. There was also a group for other post surgery people to support and uplift each other. Dr Hasan and team gave me such care that without reservation I give my recommendation. Even now 3 years later, I'm still having messages of support and encouragement from the patient liaison Tugce.”

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    You can reach us 24/7 for your questions via Obesity Information Line

    Frequently Asked Questions About Diet Before Gastric Sleeve Surgery

    Before gastric sleeve surgery, patients are usually required to follow a low-calorie, high-protein diet to reduce liver size and overall body fat. This helps to lower surgical risks and improve outcomes.

    A pre-surgery diet is crucial because it helps shrink the liver, making the surgery safer and easier to perform. It also begins the process of weight loss, setting the stage for post-surgery success.

    Patients should avoid high-fat, high-sugar foods, as well as alcohol and carbonated drinks. These can interfere with weight loss and increase surgical risks.

    The pre-surgery diet usually starts 2-4 weeks before the surgery, depending on the surgeon’s recommendations and the patient’s individual health status.

    The liquid diet typically includes protein shakes, clear broths, sugar-free gelatin, and non-fat dairy products. This diet helps to further reduce liver size and prepare the body for surgery.

    High-protein, low-sugar shakes are recommended. It's best to choose those with at least 15-20 grams of protein per serving and minimal carbohydrates and fats.

    Yes, but they should be non-starchy vegetables and low-sugar fruits in small amounts. Avoid high-carb vegetables like potatoes and corn.

    Staying hydrated is essential. Aim for at least 2 liters of water per day, but avoid drinking large amounts during meals to prevent bloating.

    It's generally recommended to reduce or eliminate caffeine intake before surgery, as it can cause dehydration and increase heart rate.

    If you have difficulties adhering to the diet, seek support from your healthcare team. They can provide guidance, meal plans, and strategies to help you stay on track.

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    You can reach us 24/7 for your questions via Obesity Information Line