Post Sleeve Gastrectomy Diet

The following advice is designed to reduce the likelihood of any complications following surgery. It is therefore very important that you follow this advice closely. There are 4 stages. Do not be tempted to skip stages or rush things. The advice is designed to help you get all the nutrients you need while helping the wounds heal in your digestive system and helping you recover from surgery.

We recommend that you spend between 1-2 weeks in each stage but you must spend a minimum of 1 week on each stage. You should be led by your body and how you are feeling. Do not try to copy or follow anyone else who has had a sleeve gastrectomy; everyone is different. If you progress too quickly and then struggle, go back to the previous stage for a few days more. You should aim to be eating ‘normal’ foods approximately 2 months after your operation.

Immediately after your surgery, once your surgeon has advised that you may sip freely, start taking your calcium and multivitamins/mineral supplements and commence Stage One (as below).

Stage one – Fluid phase (first 1-2 weeks after surgery)

All drinks should be smooth (no bits or lumps) and should be able to be sucked through a straw.

  • Start with sips and if these feel comfortable, gradually increase the amount you take in one go. Be careful not to gulp your drinks as this may result in vomiting.
  • Aim to have a minimum of 2 ½ liters (4 pints) each day to avoid becoming dehydrated. At least 1-1.5 liters of this should be nutritious liquids (see below).
  • Avoid all fizzy drinks.
  • While it is fine to drink tea, coffee, squash, water etc. you should make sure these are in addition to any drinks with a nutritional content (see below), not instead of.

Nutritious liquids:

  • Skimmed or semi-skimmed milk fortified with skimmed milk powder (1-2 tablespoons per 200 mL)
  • Build-Up, Complan (or own-brand equivalents): please note that these supplements are suitable for diabetics in the quantities prescribed below.
  • Slimfast
  • Smooth soup (homemade or tinned) fortified with 1-2 tablespoons skimmed milk powder.
  • Smoothies. (Fruit blended with milk) Homemade will be best. Shop-bought varieties will be too high in sugar.
  • Unsweetened fruit juice (limit to 1-2 small glasses a day)

Example meal plan:

Fruit smoothie (200 mL)

Fruit juice (200 mL)

Complan or Build-Up or glass semi-skimmed milk including 2 tablespoons skimmed

Mid afternoon
Slimfast (200 mL)

Fortified soup (200 mL)

Build-Up or Complan (200 mL)

(Plus tea/coffee/sugar-free squash etc. in between)

When you feel ready, move on to Stage 2

Stage two: Soft blended/Puree (weeks 3-4 after surgery)

It is still important to avoid lumps at this stage. Make sure foods are blended well.

  • Texture-wise you are aiming for yoghurt consistency.
  • Have 4-6 ‘meals’ a day. Aim to have about 1-2 tablespoons of the following every couple of hours during the day.
  • Start with 1-2 tablespoons per meal and increase this gradually if and when it feels comfortable (to no more than 4 tablespoons).
  • Chew well and eat slowly. Stop as soon as you feel full.
  • Do not drink at meal times. Wait at least 30 minutes after you eat before you drink anything.
  • Make sure you include a protein source at each meal. This is important to help wound healing.
  • Have 1 pint of milk a day . Use this to blend foods rather than water to increase the nutritional content.

Sample meal ideas/ plan (Stage 2)

Virtually fat free yoghurt/fromage frais, Soggy weetabix or ready brek (runny); Homemade fruit smoothie (made with yoghurt)

Blended tinned fruit (unsweetened); Virtually fat free yoghurt/fromage frais; Sugar-free Angel delight/custard

An example would be one of the following:

  • Thick, smooth soup (add skimmed milk powder if it doesn’t contain meat, fish, chicken or lentils)
  • Blended baked beans and mashed potato
  • Blended fish in sauce with mashed potato
  • Liquidized meat/chicken/fish stew with liquidized vegetables and mash
  • Liquidized pasta with cheese and vegetable sauce

Mid afternoon
As mid-morning

As lunch

When you feel ready, move on to Stage 3

Stage three – Soft texture (weeks 5-6 after surgery)

The texture you are aiming for now is mashed food you could eat with just a fork or spoon.

  • Lumps are now allowed! It is important you chew all food well and take your time.
  • You should reduce the frequency of meals to 3-4/day (or 3 plus a snack) and avoid eating in between. Try to establish a routine for having three meals a day and 1-2 light snacks (piece of fruit), even if you are not hungry initially at these times. This will help you to lose weight in the long term.
  • Continue to separate drinks from meals.
  • You do not need to add any extra milk, juice, slim fast etc. any more as you can now have regular foods.

Meal ideas

1 of the following options:

  • ¾ cup low sugar cereal (not muesli) with skimmed/semi-skimmed milk, 3-4 tablespoons scrambled eggs
  • 3-4 tablespoons baked beans
  • 3-4 tablespoons minced meat or turkey e.g. cottage or shepherd’s pie, Bolognese sauce 3-4 table spoons fish in sauce/fish pie
  • Soft ready meals e.g. cauliflower cheese, lasagna, macaroni cheese with soft (overcooked) pasta, couscous or mash potato and soft (overcooked) vegetables (tinned are often soft)

Snack ideas

Rice pudding, yoghurt, fromage frais, stewed or soft tinned fruit, cottage cheese, sugar-free mousse/whipped/custard

Stage four – Normal texture (approximately 6-8 weeks after surgery)

Now aim for 3 meals a day and 1-2 small snacks. The long term aim is to have 3 tea plate sized meals a day, with nutritious snacks such as a piece of fruit or yoghurt in between.

You do not need to add any extra liquid calories or additional protein any more. You no longer need to have extra milk, skimmed milk powder, fruit juice or Slimfast.

Hunger and appetite

You may not be hungry due to changes in hormone levels resulting from your operation. It is still important to have 3 meals a day – you need the nutrients! It might be tempting to skip meals if you aren’t hungry as a way to speed up weight loss but this will result in you becoming malnourished or developing unhelpful eating behaviors. Hair loss can result as a consequence of undernourishment after weight loss surgery. This is usually a sign of general undernourishment as opposed to a specific vitamin or mineral deficiency. For this reason, you should be aiming to eat a healthy balanced diet in the long-term after your operation. If you are struggling to eat all of your meal, eat the protein portion of the meal first, then the carbohydrate portion followed by the vegetables.

Dietary goals for successful weight loss after Sleeve Gastrectomy

  • Have 3 small meals a day, even if you do not feel hungry.
  • Plan nutritious snacks between meals such as a piece of fruit or a yoghurt.
  • Eat slowly: put a small amount of food in your mouth at a time and chew this very well. Eating at a table without any distractions and putting down cutlery between mouthfuls can help.
  • Do not aim to eat until you are ‘full’. Overeating will stretch your stomach pouch, cause discomfort and may make you vomit.
  • Do not drink with meals. Wait at least 30 minutes after a meal before you have a drink. Make sure you have at least 2 liters of fluid a day.
  • Avoid all fizzy drinks.
  • There are some foods that some people find a problem after a sleeve gastrectomy. These include chewy meats, white bread, rice, fibrous fruit and vegetables, nuts and seeds. These should be avoided at the beginning and re introduced slowly once a ‘normal’ diet has been established. Everyone is different to what they can manage and you will need to find out what is right for you by trial and error.

Key points to remember

Following is some advice to help with your weight loss journey:

  • Always stick to the recommended food portions.
  • You will not come to harm by eating very small portions just three times a day (remember your stomach is now approximately the size of an egg-cup).
  • Your meal should take between 20-30 minutes to eat; do not override the restrictive effect by eating excessively slowly.
  • Chew your food thoroughly before swallowing.
  • Do not eat and drink at the same time.
  • If you feel hungry between meals, take a drink to make sure you are not confusing this with thirst.
  • If you are still hungry have a small snack from the foods listed on the previous page.


As your diet becomes more solid and you progress through the stages, it is still important to maintain your fluid intake. Suitable choices would include water, no-added sugar squash, tea and coffee and up to 1/2 a liter skimmed/semi-skimmed milk per day. Avoid fizzy drinks as these may cause discomfort. You should not drink with your meals. You may find this difficult at first particularly if you are used to drinking with your meals. However, your new stomach is not big enough to cope with this anymore and if you do eat and drink together, you may vomit. Aim to wait 30 minutes after a meal before drinking.

Frequently asked questions

Are there any foods I should avoid after a sleeve gastrectomy?

You may find it difficult to tolerate some foods, and this varies from person to person. Common foods known to cause problems may be dry meat, soft white bread, rice, stringy or very fibrous vegetables, sweet corn, nuts, dried fruit, pips and seeds. Avoid these until you have established yourself on your solid diet and always try foods cautiously. If you don’t tolerate a food, try it again in a few weeks’ time. There is a lot of adaptation in the first few months. It is highly likely you will manage it with time.

Remember that alcohol is very high in calories (particularly alco-pops and stronger wines or lagers) and contains no nutrients. It can also stimulate appetite – another reason not to drink frequently.

Why should I avoid sugar and too much fat afterwards?

Avoiding foods high in fat and sugar will also help you stick to a healthy diet and optimize your long term weight loss.

Will I need to take vitamins after my operation?

Whilst it is not essential, you may wish to take a multi vitamin and mineral supplement in the initial period after your surgery. The reason for this is that during this time you may only manage very small portions and your diet may not be able to provide all the nutrients that you require. As you progress through the stages and start to get into a routine with your meals you should no longer need this supplementation.

Possible problems and solutions after a sleeve gastrectomy

Vomiting: You should not expect to be sick after a sleeve gastrectomy. If you are, it is likely you have either:

  • Eaten too much
  • Eaten too quickly
  • Not chewed the food enough
  • Had a drink too near to the meal

Ask yourself if any of these could be likely causes and try to avoid repeating the ‘mistake’ at the next meal.

If you continue to be sick and it can’t be explained by the above, you should contact your surgeon or GP.

Constipation: If you are suffering with this, check to see if you are drinking enough fluid. You should have at least 2½ liters a day. Try to choose more high fiber foods such as wholegrain products, fruit and vegetables. Regular exercise will also help to alleviate constipation. If constipation persists then you can safely take laxatives such as Resource Optifiber, milk of magnesia or Senna.

What to do if food gets stuck? This may happen if you have eaten a food that was too solid, eaten too fast or too much, or as a result of eating certain ‘problem’ foods. This will feel uncomfortable and you may wretch or vomit. It usually resolves itself, but you can try repeatedly swallowing small quantities of cold sparkling water or Diet Coke, as the fizz may help to dislodge the lump. If the trouble persists, please contact your GP or if out of hours, accident and emergency.

  • universite de montreal
  • American Society for Metabolic and Bariatric Surgery
  • mount sinai
  • Prince Mohamed bin Abdulaziz Hospital
  • International Federation for the Surgery of Obesity and Metabolic Disorders
  • King Khalid University Hospital
  • American Association of Bariatric Counselors
  • Society of American Gastrointestinal and Endoscopic Surgeons
  • mc gill
  • Society for Surgery of the Alimentary Tract
  • surgery for obesity and related diseases
  • The International College of Surgeons (ICS)
  • juniper online journal of case studies
  • Obesity Medicine
  • journal of universal surgery
  • american journal of innovative research & applied sciences
  • asian council of science editors
  • medcrave
  • insight knowledge
  • American College of Surgeons
  • Specialized Medical Center
  • Saudi German Hospitals