The SADI-S procedure (Single Anastomosis Duodeno-Ileal Bypass with Sleeve Gastrectomy) is a powerful bariatric surgery option that combines restriction of food intake with a degree of malabsorption. While it can deliver excellent weight-loss and metabolic results, the changes it creates in your digestive system mean that nutrition must be carefully managed for the rest of your life.
Getting your diet right after SADI-S is not just about avoiding deficiencies—it’s about giving your body the right fuel to heal, function well, and sustain your long-term health.
Why Nutrition is Different After SADI-S
The SADI-S procedure involves two key changes:
- A smaller stomach (sleeve gastrectomy) – This limits the amount of food you can eat at one time.
- A bypass of part of the small intestine – This reduces calorie and nutrient absorption.
Because of these changes, patients are at greater risk of nutrient deficiencies than with restrictive procedures alone. Lifelong attention to diet, hydration, and supplementation is essential.
Core Nutritional Priorities After SADI-S
1. Protein Intake
Protein supports healing, muscle preservation, and energy. After SADI-S, your smaller stomach means you need to prioritise protein at every meal.
- Target: 80–100g per day (as recommended by your dietitian)
- Sources: Lean meats, poultry, fish, eggs, low-fat dairy, tofu, legumes
2. Vitamin and Mineral Supplementation
The bypassed section of intestine reduces absorption of many nutrients. Without supplementation, deficiencies can develop quickly.
Commonly required supplements include:
- Multivitamin and mineral complex (high potency)
- Vitamin B12 – often via injections or high-dose oral/sublingual forms
- Iron – especially important for menstruating women
- Calcium citrate with Vitamin D
- Fat-soluble vitamins (A, D, E, K) – due to reduced fat absorption
3. Hydration
With reduced stomach capacity, dehydration can happen easily.
- Sip water regularly throughout the day
- Avoid drinking with meals to prevent discomfort
- Aim for at least 1.5–2 litres daily
4. Balanced Micronutrients
Even with supplements, it’s important to eat a variety of foods:
- Fresh vegetables and fruits (for fibre, antioxidants, and phytonutrients)
- Whole grains in small portions for slow-release energy
- Healthy fats from sources like olive oil, avocado, and oily fish
5. Meal Structure
Because of the smaller stomach and altered absorption:
- Eat 4–6 small meals a day
- Chew food thoroughly and eat slowly
Focus on nutrient-dense foods—avoid “empty calories” from sugary drinks, sweets, or fried foods
6. Regular Blood Tests
Nutrient levels can change over time, even if you feel well. Scheduled blood tests help identify and correct deficiencies early.
Long-Term Lifestyle Habits
Nutrition after SADI-S isn’t just about the first year—it’s a lifelong commitment. Patients who succeed long-term tend to:
- Follow their supplement plan daily
- Keep protein as the main focus of meals
- Limit alcohol and ultra-processed foods
- Attend regular follow-up appointments
Personalised Advice Matters
While these are general nutritional considerations after SADI-S surgery, every patient’s needs are unique. Factors such as age, gender, existing health conditions, activity level, and personal goals will affect what’s right for you.
That’s why at Blackrock WeightCare, nutritional guidance is a core part of our structured aftercare programme. Our experienced dietitians work closely with you to create a plan tailored to your body’s needs, track your progress, and adjust as required—ensuring you get the best long-term results, safely.
If you’ve had or are considering SADI-S surgery, following your dietitian’s advice is essential. It’s the difference between general guidance and a plan that’s truly made for you.
Your Health. We Care.
