Will I have to follow a special diet after the gastric sleeve?
Yes, there will be many changes to your diet after the gastric sleeve, and you will need to follow a special gastric sleeve diet plan after surgery to ensure your body gets what it needs to keep you healthy.
If you are considering undergoing bariatric surgery to help you lose weight, you need to understand everything that is involved in the process and the lifestyle changes that you will have to follow going forward. This article will give you an overview of what your post-op diet after a gastric sleeve will look like from just after surgery and ongoing into the future.
What Changes Does Gastric Sleeve Surgery Make?
During gastric sleeve surgery, about 80% of your stomach is cut away and removed. The portion that remains is molded into a smaller pouch-shaped tube, and the edges are stapled together to form what will be your new, significantly smaller stomach. Much of the stomach tissue that manufactures and releases ghrelin is removed during the surgery, which helps control your appetite for around two years and works in your favor during your weight loss journey.
How Soon Can I Eat Food After Gastric Sleeve Surgery?
It will be several months before you can eat solid foods, and you will be following a special gastric sleeve diet plan after surgery that will start with clear liquids and then will gradually progress over the following six to eight weeks until your stomach is able to handle regular food again.
Why You Need To Give Your Stomach Time To Heal
When your digestive system is functioning normally, it will create wave-like muscle contractions to push the food through the digestive tract. After having bariatric surgery, and while your stomach is healing, these contractions temporarily stop, so your stomach will only be able to safely process liquids.
If you were to eat solid foods, it would try to force your paralyzed stomach to do something it is unable to do, which would result in uncomfortable symptoms like nausea, and vomiting, or could lead to more severe complications.
What Does the Diet After the Gastric Sleeve Look Like?
After your surgery, you will follow a special gastric sleeve post-op diet that is designed to be gentle on your stomach and allow it to heal and transition back to solid foods.
You must follow this step-by-step progression plan carefully to gradually reintroduce different foods and textures to your stomach. This transitional diet after the gastric sleeve will help avoid unpleasant side effects like pain, or nausea or vomiting.
What To Eat After Gastric Sleeve
Your surgeon will give you a specific plan and timeline to follow that is tailored specifically for your needs and circumstances. A typical progression of gastric sleeve post-op diet plan will look something like this:
| Phase | Timeline | Examples Of Permitted Foods |
|---|---|---|
| Phase 1: You can only consume liquids during this phase, which lasts about two weeks. Week 1: You can consume only clear liquids. Week 2: You can have full liquids and protein. |
Weeks 1–2 (Days 1–14) | Water, clear broth (chicken or beef), sugar-free gelatin, clear sugar-free sports drinks, sugar-free popsicles, decaffeinated tea, and diluted apple juice. Protein shakes, strained cream soups, skim milk, sugar-free pudding, sugar-free hot chocolate, and plain Greek yogurt with no chunks. |
| Phase 2: Pureed foods that are smooth and thick, like baby food, with no chunks at all. | Week 3 (Days 15–21) |
Soft scrambled eggs, mashed avocado, cottage cheese, protein smoothies, hummus, pureed chicken with broth, pureed canned tuna, and refried beans. |
| Phase 3: This is the soft foods phase and usually starts once your stomach is tolerating liquids well. They should be soft, easy to chew, and gentle on your stomach. |
Weeks 4–5 (Days 22–35) |
Baked fish, soft egg salad, ground turkey, canned tuna, mashed beans, soft-cooked vegetables, bananas, and Greek yogurt. |
| Phase 4: Solids can be introduced during this phase. Your portions should stay small, bites should be tiny, and your food should be chewed very well. | Week 6– Onwards | Baked fish, grilled chicken breast, lean ground beef, steamed vegetables, fresh fruits (peeled), brown rice, and whole-grain toast. It is best to avoid highly processed foods, dry foods, and tough meats as they are harder for your stomach to tolerate until much later on. |
What Can Happen If I Do Not Follow My Gastric Sleeve Diet Plan After Surgery?
Not following your transitional post-op diet after gastric sleeve surgery can result in you experiencing symptoms that are not only painful but also dangerous as well.
Putting foods into your stomach that it is not ready or able to process yet can cause diarrhea, constipation, dehydration, bowel obstruction, acid reflux, or leaking from the staple line, which is a life-threatening emergency and requires immediate medical attention. If you fail to follow your diet after gastric sleeve surgery in the long term, it can result in nutritional deficiencies or weight gain.
If you cheat on your gastric sleeve diet plan after surgery, it can gradually allow your stomach to hold more and more food and remove the benefits of the restrictions that gastric sleeve surgery creates.
Eating solids too soon can significantly increase the chances of experiencing painful reflux and heartburn. It takes around six hours to digest solid foods, but liquids only take about half the amount of time. Some patients have had symptoms of severe chest pain and heartburn after eating solid foods too soon.
How Much Can You Eat After Gastric Sleeve?
During gastric sleeve surgery, the capacity of your stomach is significantly reduced. You will not be able to eat as much as you did before, and it is important for you to understand exactly how much your stomach can hold. You need to prioritize nutrition and ensure your body gets what it needs, but be mindful that you do not overeat and experience complications. Following is an example of a typical timeline that will give you an idea of how much your new, smaller stomach can hold during the different phases of the post-op diet after a gastric sleeve.
Stomach Capacity After Gastric Sleeve
Days 1–14: Liquids Only Phase
Right after your surgery, your new, smaller stomach can only hold about 2 to 3 ounces of liquid, which is about 4 to 6 tablespoons during each meal. Your stomach will be swollen and inflamed during this time, which is normal, but it further limits how much your stomach can hold. It is important to stay properly hydrated because this is the number one reason patients must be readmitted to the hospital after a gastric sleeve. Taking small sips of water or clear liquid throughout the day will make it easier for you to stay properly hydrated.
Weeks 3–6: Pureed and Soft Foods Phases
At this point, the size of your portions will increase slightly and range from one-quarter cup to one-half cup for each meal, which is between 2 and 4 ounces. Your stomach is still healing, and the staple line still needs more time to become strong enough to handle regular foods. You do not want to push your stomach beyond these small amounts because this is too risky and can result in serious complications.
Months 3–6: Progress Toward Regular Foods
The swelling in your stomach will continue to go down, and as it does, your stomach capacity will increase slightly and will be able to handle larger portions. The portions you will consume at each meal will be far less than you could eat before your surgery, but they will be a bit larger than during the early phase of your gastric sleeve diet plan. Most patients can eat between one-half cup and three-quarters of a cup during each meal, which is around 4 to 6 ounces of food. The most important part of your meal is protein. You should eat it first, and it should make up about 70% of each meal.
Months 6–12: Introduction Of More Solid Foods
Your stomach gradually becomes stronger and becomes accustomed to its new shape and size, and can handle many different solid foods. Normally, in the timeframe between 6 and 12 months, patients can eat about 1 cup (8 oz) of food at each meal.
12 Months–Onwards: Long-Term Maintenance
Once you have carefully navigated your way through all the phases of the gastric sleeve diet, after 1 year, you should be able to eat between one cup (8 oz) and one-and-one-half cups (10 oz) of food during each meal, and this will be your normal portion size going forward.
Does the Order in Which I Eat My Food Matter After Gastric Sleeve?
Yes. Eating your food in a certain order matters very much after you have had gastric sleeve surgery.
You need to eat your protein first, then your vegetables, and carbs last if you have any more room. Protein should make up about 70% of what is on your plate, vegetables should be about 20%, and then carbs, fruits, and healthy fats in very small amounts.
Since your stomach is much smaller, eating protein first ensures that you consume what your body needs and that you do not get full eating other foods that do not offer as much nutrition. Protein is vital to your muscles, keeps you feeling full longer, gives you energy, and provides your body with what it needs to heal and to function properly.
Do I Need To Watch The Order Of When I Am Drinking Water?
Yes, it is also very important that you drink liquids in a certain order as well. Meal times should be reserved for getting enough protein, but it is also critical that you stay properly hydrated. So what is the best way to get enough liquids when you cannot drink with meals? You should set reminders on your phone or watch spaced 30 minutes to an hour apart and drink little bits throughout the day with the exception of mealtimes.
You should not drink 30 minutes before or after a meal. Drinking too close to your meals can push food through your stomach pouch too fast and make you feel uncomfortable, less full, or even sick. Liquids can also wash food away before your body has time to digest it, which means you may not absorb nutrients as well.
What Foods Should I Exclude From My Diet After Gastric Sleeve?
Alcohol is one of the biggest things to avoid for a few reasons. Your body will absorb it faster than it did before, so it can feel much stronger even in small amounts. It can also raise your blood sugar quickly and lead to dizziness, sweating, shakiness, or weakness. Also, your body treats it as a toxin, so it becomes busy processing the alcohol to remove it from your system instead of focusing on burning calories for energy, so it actually impedes your weight loss progress. Other foods that commonly cause problems include:
- Pasta, bread, rice, and oatmeal;
- Tough meats like steak, dry chicken or turkey breast, or thick cuts of fish;
- Grilled meats that are dry or chewy;
- Fruits and vegetables with tough skins, unless they are peeled;
- Desserts and sugary drinks;
- Fried foods and high-fat foods like butter and full-fat dairy;
- Snack foods like chips, cookies, and pastries.
Everyone tolerates foods differently after gastric sleeve surgery, and it can take several months to learn what works for your body and the choices that make you feel ill.
Learn More About Losing Weight With Gastric Sleeve And The Post-Op Diet
If you are thinking about gastric sleeve surgery and want some real answers, the expert bariatric team at the Laparoscopic & Endoscopic Surgery Institute (LESI) is a great place to start. Their knowledgeable team of specialists will listen and work with you to lay out your goals, learn how the surgery works, and understand the gastric sleeve diet that can help you achieve sustainable weight loss.
The specialists at LESI will guide you through each step of the process and help you decide what the best medical intervention would be for you and your circumstances. Losing weight can significantly improve your health and your quality of life. Set up a consultation today and take the first step toward feeling healthier and more in control of your weight.
FAQs
Can I Ever Eat a Full Meal After Gastric Sleeve?
You will not be able to eat large meals as you did before your surgery, but you will be able to gradually eat more as your transitional diet progresses. As your stomach heals and adjusts, your portions will slowly increase. By about one year after surgery, you should be able to eat around one cup of food during each meal and feel satisfied.
What Is the Best Diet After Gastric Sleeve Surgery?
The best diet after gastric sleeve surgery is one that focuses on consuming protein first. Meals are centered around lean protein, followed by soft vegetables, with small amounts of carbs and healthy fats if there is room. This type of diet helps your body heal, stay full longer, and promotes steady weight loss while maintaining critical muscle mass.
Will I Be Able to Eat Ramen Noodles After Gastric Sleeve Surgery?
You should avoid eating ramen noodles after gastric sleeve surgery. They are highly processed, full of refined carbohydrates, very soft, and they can travel very quickly through your digestive system without satisfying your hunger. They are also very low in protein, high in sodium, and do not provide much nutrition, but they take up valuable space in your small stomach, so they fill you up without giving your body what it needs.
Can I Eat Rice After Gastric Sleeve Surgery?
It is not a good idea to eat rice after gastric sleeve surgery because it can be hard for your stomach to digest. Many people can no longer tolerate digesting rice at all after their gastric sleeve surgery because it expands in the stomach and can make you uncomfortable or feel bloated. If you do attempt to reintroduce rice into your diet, do it very slowly and eat very small portions.
