Gastric Sleeve Nutrition Guide
Istanbul Obesity Center

🌿 Gastric Sleeve Nutrition Guide

Your complete post-surgery nutrition companion — calorie calculator, meal plans, FAQ & daily tracker

Daily Calorie & Protein Calculator

⚠️ Always follow your surgeon’s and dietitian’s specific recommendations. This guide is based on Istanbul Obesity Center’s official patient nutrition guide.
Allowed: water, sugar-free herbal teas (mint, chamomile, linden, fennel, sage), clear fat-free broths (chicken, beef, vegetable), sugar-free gelatin, low-sugar isotonic drinks
Sip slowly — do not exceed 200 ml per hour during the first 2 weeks
Target at least 1.5 litres of total fluid per day
No carbonated drinks, alcohol, or high-sugar liquids
Protein shakes are essential for the first 2 weeks to prevent muscle loss and support healing
Tip: add apple slices, cinnamon bark, fresh mint or basil to water for flavour. Brew fruit teas and freeze as ice cubes
Allowed: pureed vegetables (carrot, zucchini, potato), pureed lean meats (chicken, turkey, fish), low-fat yogurt, cottage cheese, mashed banana, oatmeal, semolina
Eat slowly and chew thoroughly — aim for 20–25 minutes per meal
Limit portions to 2–3 tablespoons per meal; aim for 5–6 small meals daily
Avoid spicy, acidic, and salty foods
Do not drink 30 minutes before or after meals
Allowed: soft cooked vegetables (mashed peas, cooked spinach), tender lean meats (chicken, turkey, fish), soft fruits (banana, melon, peach), low-fat dairy, eggs (boiled, scrambled, omelette)
Prioritise protein at every meal to prevent muscle loss
Stop eating immediately when you feel full — never force yourself
Avoid high-fat and sugary foods
From day 10: ask your doctor about starting light swimming. Avoid strenuous exercise for 1 month
Allowed: lean proteins (chicken, fish, lean red meat), fresh steamed/boiled vegetables, lower-sugar fruits, whole grains (quinoa, brown rice, whole wheat), low-fat dairy
Always eat protein first at every meal — then vegetables — then complex carbs
Take daily supplements: iron, B12, calcium, vitamin D, zinc, biotin
Avoid carbonated drinks, alcohol, and sugary foods permanently
Spices allowed after 1 month if tolerated. Avoid citrus fruits (mandarin, orange, grapefruit) for 1 month
After 1 month: varied sports and more intense exercise allowed
Small portions: Aim for 5–6 small meals daily
Slow eating: Eating too fast leads to overeating — your stomach needs time to signal fullness
Water timing: Drink at least 30 minutes before or after meals. Target 1.5–2 litres daily
Protein first: Chicken, fish, eggs, dairy, protein shakes at every meal
Vitamins: Iron, B12, calcium, vitamin D as prescribed. Zinc & biotin help prevent hair loss (months 3–9)
Food diary: Track your intake for portion control and meal plan adherence
Follow-ups: Regular appointments with your doctor and dietitian are essential

Common Questions After Gastric Sleeve Surgery

0 kcal
Calories
0800
0 g
Protein
060

💧 Water Intake

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Goal: 1500 ml · Drink 30 min before/after meals
+100 ml
+150 ml
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🍽️ Food Log

Greek yoghurt
Protein shake
Boiled egg
Chicken
Cottage cheese
Broth
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