1️⃣ Protein is non-negotiable
Post-bariatric target:
👉 60–80 g protein/day (minimum)
For blood type O this aligns well as many protein sources are beneficial:
- lean red meat (very small portions)
- minced beef
- eggs
- fish
- chicken thighs (soft, moist)
- bone broth
Start with:
- 2–3 tablespoons per meal
- build slowly
2️⃣ Prevent lean muscle loss
Rapid weight loss = muscle loss risk
So include:
- protein first at every meal (meat, fish, eggs, protein powder)
- resistance exercise when medically cleared
- leucine-rich foods (eggs, beef, fish)
3️⃣ Micronutrient density (very important)
High risk post sleeve of low levels of:
- B12
- iron
- folate
- zinc
- vitamin D
- calcium
Food first approach for O Blood Type:
Weekly “nutrient boosters” Tiny amounts, high impact:
- Liver pâté – 1 tsp twice weekly → iron, B12
- Engevita Flakes – 1 tsp twice weekly B12, other B Vitamins and zinc
- Sardines – calcium, vitamin D, omega-3
- Egg yolks – choline, fat-soluble vitamins
- Tahini – calcium (watch portion size)
- Bone broth – collagen + glycine (gut support)
4️⃣ Blood sugar stability
Metformin helps to balance it, but meals must:
- avoid liquid carbs (sweet fruit juice without fibre)
- avoid grazing on soft carbs (bread, biscuits
- pair protein + fibre
Good early carbs (small):
- mashed sweet potato
- well-cooked carrots
- butternut squash
- puréed lentils (if tolerated)
Avoid as these foods are high carbohydrate and will affect Blood Sugars:
- bread white or brown
- wraps
- rice
- pasta
- fruit juices
- smoothies with sweet fruit only
- raw vegetables
- tough steak
These either:
cause dumping/ diarrhoea, stretching of the pouch, or displace protein absorption.
Texture Rules for Week 1
All foods must be:
- moist
- soft
- minced or flaky
- sauce/broth added
- chewed to paste
