The bariatric diet is a structured eating plan used after weight loss surgery to support recovery and long-term health. It is divided into four phases, liquid, pureed, soft, and general, which gradually help the body adjust to solid foods.

The progression of the bariatric diet depends on individual tolerance and overall health, making medical and nutritional follow-up essential. Each phase includes specific food types, portion sizes, and eating habits to help the digestive system adapt.

The bariatric diet often includes protein and vitamin supplements to help prevent deficiencies. Long-term success depends on eating small portions, prioritizing protein-rich foods, and avoiding foods that can cause discomfort or dumping syndrome.

foods that are part of the bariatric diet

Main phases

The bariatric diet is divided into 4 phases: liquid, pureed, soft food, and general, or regular. Each phase helps the stomach adjust to food texture, portion size, and digestion after surgery.

According to the American Society for Metabolic and Bariatric Surgery, most people start with liquids after bariatric surgery and gradually move toward solid foods under the guidance of their bariatric care team.

Nutrition after bariatric surgery also includes vitamin and protein supplements, and in some cases, specialized nutrition formulas. These should be recommended by a doctor or registered dietitian.

The post-bariatric diet is divided into phases based on the person’s tolerance:

Phase 1: liquid diet

Foods allowed on the liquid diet include:

Still water
Coconut water
Chicken, beef, or vegetable broth, fat-free and strained
Sugar-free gelatin
Sugar-free popsicles
Natural non-citrus fruit juices, blended and well strained
Milk
High-protein drinkable yogurt
Caffeine-free teas, such as chamomile, lemon balm, lemongrass, mint, and linden tea

Food should be consumed slowly, and straws should be avoided.

The liquid diet starts right after surgery and may last up to 2 weeks. During this time, foods should be consumed in small amounts (about 50 mL) every 30 minutes to support hydration, allow the stomach to rest, and aid adaptation

It is also important to take the supplements recommended by the doctor or registered dietitian, such as whey protein. Since lactose intolerance may develop in some people, the dietitian may remove lactose from the liquid diet.

The table below provides an example of a liquid diet menu:

Meal	Liquid diet
Breakfast (08:00)	50 mL of drinkable yogurt
2nd meal (08:30)	50 mL of strained papaya juice without sugar
3rd meal (09:00)	50 mL of chamomile tea without sugar
4th meal (09:30)	50 mL of strained pear juice without sugar
5th meal (10:00)	50 mL of lemon balm tea without sugar
6th meal (10:30)	50 mL of sugar-free liquid gelatin
7th meal (11:00)	50 mL of coconut water
8th meal (11:30)	50 mL of strained apple juice without sugar
Lunch (12:00)	50 mL of fat-free, strained chicken broth

It is important to eat slowly and take your time with each meal. Eating or drinking too quickly can stretch the stomach pouch or the connection to the intestine, which may lead to complications.

Phase 2: pureed diet

Foods allowed in this phase include:

Milk, yogurt, and unsweetened low-fat plant-based drinks, such as skim milk, cottage cheese, soy milk, or oat milk
Pureed vegetables or low-fat creamy soups, such as pumpkin, potato, carrot, yam, zucchini, chayote, or eggplant
Bean broth
Non-citrus fruits that are cooked, baked, or prepared as smoothies or well-diluted juices
Lean proteins, ground or blended, such as eggs, tofu, turkey, chicken, or fish, according to individual tolerance
Porridge made from cereals such as corn, rice, or oats
Beverages such as water, coconut water, and tea, consumed in small amounts and between meals

It is recommended to start meals with protein to help ensure adequate intake, especially if early fullness occurs.

The pureed diet typically begins 7 to 10 days after bariatric surgery. This phase supports gastric rest and marks the transition to a soft food diet.

The table below shows an example of a pureed diet menu:

Meal	Pureed diet
Breakfast	Oatmeal
Morning snack	Cooked pear
Lunch	Shredded chicken breast + mashed sweet potato + sugar-free gelatin
Afternoon snack	Cooked apple
Dinner	Vegetable soup + shredded fish + cooked pear
Evening snack	Natural fruit popsicle

The pureed diet consists of 5 to 6 meals per day, with portions between 150 and 200 mL. Liquids should be avoided with main meals.

Some people may develop food intolerances, so it is important to watch for gastrointestinal symptoms as foods are added to the diet.

Phase 3: soft diet

Foods recommended in this phase include:

Low-fat ground or shredded proteins, such as chicken, fish, tofu, eggs, and turkey
Dairy products, such as milk, yogurt, and soft, low-fat cheeses
Non-citrus fruits that are cooked or ripe and peeled, such as banana, apple, melon, watermelon, papaya, and pear
Well-cooked vegetables, such as eggplant, tomato, pumpkin, okra, carrot, chayote, and zucchini
Legumes, such as beans, chickpeas, soybeans, and lentils
Cereals, such as cooked rice, cooked pasta, soft crustless bread, and oatmeal
Mashed or pureed tubers, such as potato, cassava, and yam

The soft diet lasts about 15 days on average. Foods should be well cooked, baked, or grilled to make chewing and digestion easier.

Foods should be eaten in small amounts, divided into 5 to 6 meals per day. It is important to chew each bite well, even if the food is soft, to make digestion easier.

Liquids should only be consumed between meals, with at least a 30-minute interval. Drinking plenty of water is also essential to prevent dehydration.

The table below shows an example of a soft diet menu:

Meal	Soft diet
Breakfast	200 mL of skim milk with 1 slice of crustless bread and 1 slice of white cheese
Morning snack	1 small ripe banana
Lunch	2 oz (60 g) of shredded fish + 2 tablespoons of well-cooked rice + 2 tablespoons of cooked eggplant and carrot
Afternoon snack	1 slice of crustless bread with white cheese
Dinner	2 oz (60 g) of shredded chicken + 2 tablespoons of mashed potato + 2 tablespoons of cooked zucchini and carrot
Evening snack	200 mL of chamomile tea with 1 plain tea biscuit

All recommended supplements should be continued as directed by the dietitian.

During this phase, fibrous or dry meats, breads with hard crusts or toast, dried fruits or fruits with tough skins, raw vegetables, and fried, fatty, or spicy foods should be avoided. Carbonated or caffeinated drinks should also be avoided.

Phase 4: general diet

The general, or regular, diet usually starts around 4 to 6 weeks after bariatric surgery, depending on the person’s tolerance and the guidance of the doctor or registered dietitian.

In this phase, the person returns to eating foods with a normal consistency. However, some precautions should be maintained to help the digestive system adapt and prevent complications.

The main recommendations include:

Eat small portions
Chew food well
Eat slowly
Have 5 to 6 meals per day
Drink liquids only between meals
Drink at least 2 liters of water per day

During the regular diet phase, proteins such as lean meats, fish, eggs, legumes, and low-fat dairy products should be prioritized.

According to the American Society for Metabolic and Bariatric Surgery, people should aim for 60 to 100 grams of protein per day after bariatric surgery, based on their care team’s guidance. Fruits, vegetables, legumes, whole grains, and tubers should be included according to individual tolerance.

Nutritional supplements, such as calcium, vitamin D, vitamin B12, and iron, should also be continued as prescribed.

The table below provides an example of a regular diet menu:

Meal	Regular diet
Breakfast	200 mL of skim milk + 1 oat and banana pancake + 1 teaspoon of peanut butter
Morning snack	1 small apple with skin
Lunch	2 oz (60 g) of grilled fish + 2 tablespoons of rice + 1 tablespoon of beans + lettuce, onion, and tomato salad seasoned with 1 teaspoon of olive oil
Afternoon snack	1 slice of bread with 1 slice of cheese
Dinner	2 oz (60 g) of roasted skinless chicken + baked sweet potato + arugula salad with cilantro and tomato, seasoned with 1 teaspoon of olive oil
Evening snack	1 boiled egg + 1 cup of chamomile tea

This menu is only an example. The types and amounts of food should be adjusted according to individual tolerance, so it is important to consult a registered dietitian to develop a personalized nutrition plan.

Although this phase allows a greater variety of foods, it is important to avoid fatty foods, sugary foods, fried foods, processed meats, alcoholic beverages, and ultra-processed foods. These foods can cause gastrointestinal discomfort, make weight loss more difficult, or trigger dumping syndrome.

This phase is the beginning of a lifelong eating plan. Adopting healthy and sustainable habits is essential for long-term success after surgery.

General recommendations

Some general recommendations that should be followed after bariatric surgery include:

Eat small portions of balanced, healthy meals.
Maintain a low-calorie diet with nutritional guidance.
Eat very slowly and chew food well. For liquids, take small sips.
Avoid using straws.
Stop eating when you feel full.
Avoid carbonated water.
Wait at least 30 minutes after meals before drinking liquids.
Drink 100 to 150 mL of water at a time to prevent dehydration, gradually increasing according to tolerance until reaching 2 liters per day.
Drink caffeinated beverages, such as coffee, yerba mate tea, green tea, or black tea, only after the third month after bariatric surgery.
Season foods with herbs and natural spices, avoiding pepper, ready-made seasonings, mustard, Worcestershire sauce, soy sauce, mayonnaise, ketchup, or other processed sauces.
Avoid sugary drinks, such as boxed juice, soda, and chocolate drinks.
Avoid citrus fruits and raw fruits with pulp, seeds, or skin until solid foods are well tolerated.
Avoid foods high in sugar, such as chocolate, candy, ice cream, chewing gum, and other sweets.
Avoid whole milk, yellow cheeses, condensed milk, heavy cream, sweetened yogurt, fried foods, and sausages.

It is essential to adopt new eating habits after bariatric surgery and maintain a healthy, balanced diet.

These measures support weight loss and help prevent nutritional deficiencies and gastrointestinal discomfort.

Bariatric Diet: What to Eat After Surgery