General Practice 2022

Diet pós-bariátrica: what to eat and what to avoid

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Diet pós-bariátrica: what to eat and what to avoid
Diet pós-bariátrica: what to eat and what to avoid

After undergoing bariatric surgery, the person needs to be on a liquid diet for about 15 days, and then can start on a soft diet for approximately 20 more days.

After this period, solid foods can be introduced little by little, but food usually only returns to normal, about 3 months after the surgery. However, these time periods may vary, depending on the type of tolerance that each person has after surgery.

Doing this adaptation time is very important because the person's stomach is very small and only fits about 200 ml of liquid, which is why the person loses weight fast, because even if you want to eat a lot, you will feel very uncomfortable because literally the food will not fit in the stomach.

1st phase: liquid diet

The liquid diet starts right after surgery and usually lasts between 1 to 2 weeks. During this period, food can only be consumed in liquid form and in small volumes, about 100 to 150 ml, with about 6 to 8 meals a day, with an interval of 2 hours between meals. During the liquid diet period, it is common to go through the following phases:

  • Diet of clear liquids: this is the first phase of the liquid diet that should be done during the first 7 days after surgery, being based on fat-free soup, strained fruit juices, teas and water. The diet should be started with a volume of 30 mL and progressively increased until reaching 60 mL at the end of the first week.
  • Grinded diet: after the first 7 days, this type of diet can be added, which consists of ingesting some types of crushed foods, increasing the amount of liquids from 60 to 100ml.Allowed foods include non-citrus fruit teas and juices, cereals such as oatmeal or cream of rice, white meats, unsweetened gelatin, vegetables such as squash, celery or yams, and cooked vegetables such as zucchini, eggplant or chayote.

Food has to be ingested slowly, it can take up to 40 minutes to have a glass of soup, and straws should not be used to ingest them either.

It is still extremely important to drink between 60 to 100 ml of water throughout the day, in small amounts, and to take the supplements prescribed by the doctor, to guarantee the amount of vitamins that the body needs.

2nd phase: soft diet

The soft diet should start about 15 days after the surgery, and in it the person can only eat soft foods such as vegetable creams, porridges, cooked or raw fruit purees, legume purees, protein or vitamin purees of fruit blended with soy juice or water, for example.

In this phase of the diet, the volume ingested should be between 150 and 200 mL, and fluid intake should be avoided together with the main meals. Check out a menu and some pasty diet recipes that you can use after bariatric surgery.

3rd stage: solid foods

About 30 to 45 days after bariatric surgery, the person can go back to eating solid foods that need to be chewed but in small amounts over 6 meals a day. At this stage it may be useful to use a small dessert plate to eat small amounts at each meal.

Liquids should only be ingested between meals, it is important to drink at least 2L of water a day to prevent dehydration.

From this stage, the patient can eat fruits, vegetables, whole grains, milk and dairy products, meat, fish, eggs, pasta, rice, potatoes, whole grains and seeds in small amounts and according to their tolerance.

Diet menu after bariatric surgery

Here is an example of a menu for the different phases of the diet after bariatric surgery:

Meals Clear liquid diet Grinded diet
Breakfast 30 to 60 ml of strained papaya juice 60 to 100 mL of cream of rice (no milk) + 1 tablespoon (dessert) of protein powder
Morning snack 30 to 60 ml of linden tea 60 to 100 mL strained papaya juice + 1 tablespoon (dessert) protein powder
Lunch 30 to 60 ml of fat-free chicken soup 60 to 100 ml of crushed vegetable soup (pumpkin + zucchini + chicken)
Snack 1 30 to 60 mL unsweetened liquid gelatin + 1 tablespoon (dessert) protein powder 60 to 100 ml peach juice + 1 tablespoon (dessert) protein powder
Snack 2 30 to 60 ml of strained pear juice 60 to 100 mL unsweetened liquid gelatin + 1 tablespoon (dessert) protein powder
Dinner 30 to 60 ml of fat-free chicken soup 60 to 100 ml of vegetable soup (celery + chayote + chicken)
Supper 30 to 60 ml of strained peach juice 60 to 100 ml apple juice + 1 tablespoon (dessert) protein powder

It is important that between each meal you drink about 30 ml of water or tea and, around 9 pm, you should take a nutritional supplement such as glucer.

Meals Soft diet Semi-solid diet
Breakfast 100 to 150 ml oatmeal with skim milk + 1 dessert spoon of protein powder 100 ml skimmed milk with 1 slice of toasted bread with 1 slice of white cheese
Morning snack 100 to 150 ml papaya juice + 1 tablespoon (dessert) protein powder 1 small banana
Lunch 100 to 150 ml of shredded vegetable soup with chicken + 1 tablespoon of pumpkin puree without butter 1 tablespoon of crushed carrots, 2 tablespoons of ground beef and 1 tablespoon of rice
Snack 100 to 150 g of apple, cooked and crushed 200 ml of chamomile tea + 1 slice of toasted bread
Dinner 100 to 150 ml of mixed vegetable soup with fish + 2 tablespoons of mashed potatoes without butter 30 g of shredded chicken + 2 tablespoons of mashed potatoes
Supper 100 to 150 ml pear juice + 1 tablespoon (dessert) protein powder 200 ml of chamomile tea with 1 cream cracker

During these phases it is recommended to drink between 100 and 150 ml of water or tea between each meal and gradually increase according to individual tolerance, reaching 2 liters of water per day.

What you can't eat

For the first 3 months after gastric bypass surgery, foods such as:

  • Coffee, mate tea, green tea;
  • Pepper, chemical condiments such as Knorr, Sazon, mustard, ketchup or Worcestershire sauce;
  • Powdered industrialized juices, soft drinks, as well as carbonated water;
  • Chocolate, candies, chewing gum and sweets in general;
  • Frying dishes;
  • Alcoholic beverage.

Furthermore, foods such as chocolate mousse, condensed milk or ice cream are very caloric and should be avoided, and even consumed in small amounts can make you gain weight again.

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