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
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