Bariatric surgery has the most demanding pre-operative and post-operative requirements of any medical tourism procedure. Understanding and committing to these requirements before you book is essential — not optional. Surgeons who skip the pre-op protocol or minimize the post-op commitment are cutting corners that affect your safety and long-term success.
Pre-Operative Requirements
1. The liver-shrinking diet (2–4 weeks before surgery)
Your liver sits directly on top of your stomach. In patients with elevated BMI, the liver is often enlarged and fatty, making surgical access to the stomach difficult and risky. The liver-shrinking diet reduces liver volume by 20–30%, creating the space your surgeon needs.
Typical protocol:
- High protein (80–120g/day): lean meats, fish, eggs, protein shakes
- Low carbohydrate (< 50g/day): no bread, pasta, rice, sugar, potatoes
- No alcohol (alcohol increases liver fat)
- Hydration: 64+ ounces of water daily
- Duration: 2 weeks minimum, 4 weeks for higher BMI patients
2. Blood work and medical clearance
- CBC, metabolic panel, lipid panel, liver function
- HbA1c (diabetes screening/monitoring)
- Thyroid panel (ruling out hypothyroidism as a cause of weight gain)
- Vitamin D, B12, iron, folate (baseline nutritional levels)
- H. pylori screening (bacterial infection that must be treated before surgery)
- EKG and cardiac clearance (especially for BMI > 40 or patients over 40)
- Chest X-ray
- Sleep study if obstructive sleep apnea suspected
3. Psychological evaluation
Standard in bariatric surgery globally. Assesses readiness for lifestyle changes, relationship with food, mental health stability, and support system. Some Colombian clinics conduct this via video call before arrival; others do it in person.
4. Medication adjustments
- Stop blood thinners (aspirin, warfarin, Eliquis) per your surgeon's timeline (typically 7–14 days before surgery)
- Stop NSAIDs (ibuprofen, naproxen) — these are contraindicated after gastric sleeve
- Adjust diabetes medications (dosages change rapidly after surgery)
- Stop smoking (minimum 4 weeks before surgery; ideally 8+)
Post-Operative Diet Progression
| Phase | Duration | Allowed Foods | Key Rules |
|---|---|---|---|
| Phase 1: Clear liquids | Days 1–3 | Water, broth, sugar-free gelatin, herbal tea | Sip slowly (1 oz every 15 min). No straws. |
| Phase 2: Full liquids | Days 4–14 | Protein shakes, yogurt, cream soups (strained), milk | 60g protein/day target. No sugar. |
| Phase 3: Puréed foods | Weeks 3–4 | Blended meats, hummus, scrambled eggs, cottage cheese, baby food texture | 2–4 tablespoons per meal. Protein first. |
| Phase 4: Soft foods | Weeks 5–6 | Soft-cooked fish, canned tuna, beans, soft vegetables | Chew thoroughly (20+ times per bite). |
| Phase 5: Regular food | Week 7+ | Most foods tolerated, in small portions | 3–4 oz per meal. Protein first, then vegetables, then carbs last. |
Lifelong Nutritional Requirements
After gastric sleeve, your smaller stomach absorbs fewer nutrients. Vitamin and mineral supplementation is required for life — not optional:
- Bariatric multivitamin — daily (standard multivitamins don't have adequate amounts)
- Vitamin B12 — 1,000 mcg sublingual daily or monthly injection
- Calcium citrate — 1,200–1,500 mg/day (divided into 2–3 doses; citrate form absorbs better than carbonate without stomach acid)
- Vitamin D3 — 3,000–5,000 IU daily
- Iron — as needed based on blood work (especially for menstruating women)
- Folate — especially important for women of childbearing age
Eating Rules for Life
- Protein first — every meal starts with protein (goal: 60–80g/day)
- No drinking with meals — liquids wash food through your stomach too quickly, reducing satiety. Stop drinking 30 minutes before meals, resume 30 minutes after.
- Eat slowly — 20–30 minutes per meal. Eating too fast causes pain, nausea, and vomiting.
- No carbonated drinks — gas expansion in your small stomach causes pain
- No sugar — concentrated sugars can cause dumping syndrome (nausea, cramping, diarrhea)
- Small portions — your stomach holds 3–5 oz. Overeating is physically painful.
Follow-Up Schedule After Returning Home
- 2 weeks post-op: PCP visit for wound check and blood work
- 6 weeks: Nutritional assessment and blood work
- 3 months: Weight check, blood work, vitamin levels
- 6 months: Comprehensive labs, nutritional counseling
- 12 months: Full annual panel — CBC, metabolic, vitamins, minerals, liver function
- Annually thereafter: Lifelong annual labs and nutritional monitoring
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