Oldest blood type (~40,000–25,000 BCE). Descended from hunter-gatherer ancestors who thrived on animal protein.

Thrives on:

• Lean red meat, poultry, fish
• Most vegetables (especially leafy greens)
• Limited grains — especially wheat and gluten

Avoid:

• Wheat, corn, legumes (beans, lentils)
• Dairy — especially cow's milk
• Pork, goose, octopus

Emerged ~20,000–15,000 BCE with the rise of agriculture. Type A ancestors shifted from hunting to farming.

Thrives on:

• Fresh vegetables, fruits, legumes
• Whole grains, tofu, soy
• Fish (salmon, sardines, cod)

Avoid:

• Red meat, especially beef and pork
• Dairy products
• Kidney beans, lima beans, wheat

Appeared ~15,000–10,000 BCE among nomadic Himalayan peoples. Type B is the most flexible of the four types.

Thrives on:

• Lamb, mutton, rabbit, turkey
• Dairy products — among the few types that can
• Vegetables, eggs, some grains

Avoid:

• Chicken, pork, shellfish
• Corn, wheat, lentils, peanuts
• Sesame seeds, buckwheat

The rarest and most recent blood type (~1,000 years old). A biological fusion of Type A and Type B.

Thrives on:

• Tofu, seafood, dairy, green vegetables
• Cultured dairy (yogurt, kefir)
• Moderate amounts of both plant and animal foods

Avoid:

• Red meat, smoked or cured meats
• Kidney beans, corn, buckwheat
• Caffeine, alcohol (especially in stressful periods)

• Vitamin B — Type O's high-protein metabolism burns through B vitamins quickly. B12 and B-complex support energy and neurological function.
• Vitamin K — Type O blood clots less efficiently. Vitamin K supports healthy clotting and bone metabolism.
• Kelp / Iodine — Type O has a tendency toward an underactive thyroid. Iodine-rich kelp supports thyroid function and metabolism.
• Licorice Root — Supports the adrenal glands, which Type O tends to overactivate under stress.
• Slippery Elm — Soothes the GI tract; Type O has higher stomach acid and is prone to ulcers.

• Vitamin B12 — Type A produces less intrinsic factor, making B12 absorption less efficient. Deficiency can cause fatigue and neurological issues.
• Folic Acid — Supports DNA synthesis and cell repair. Type A benefits especially during periods of stress or high physical demand.
• Iron (low-dose) — Type A's plant-based diet can be lower in heme iron. A gentle supplement prevents deficiency without overloading.
• Hawthorn — Supports cardiovascular health — an area of concern for Type A, who is prone to higher cortisol and heart disease risk.
• Echinacea — Boosts immune function. Type A tends toward a more sensitive immune system.
• Valerian — Calms nervous tension. Type A has naturally higher cortisol and benefits from stress-reducing adaptogens.

• Magnesium — Supports muscle function and nervous system balance. Type B is prone to fatigue and viral infections when run down.
• Licorice Root — Antiviral and immune-supporting. Type B is particularly susceptible to slow-acting viral infections.
• Ginkgo Biloba — Enhances memory and circulation. Type B has a predisposition toward neurological conditions when diet is off.
• Lecithin — Supports brain and liver function. Particularly important when Type B consumes chicken or pork (which they should limit).
• Vitamin C — Supports immune resilience and adrenal function for the active Type B lifestyle.

• Vitamin C — Type AB is susceptible to certain cancers and infections. Vitamin C is a powerful antioxidant and immune booster.
• Hawthorn — Like Type A, AB has cardiovascular sensitivities. Hawthorn supports heart function and healthy blood pressure.
• Echinacea — Type AB's dual antigens create unique immune challenges. Echinacea strengthens immune response.
• Valerian — Reduces the stress and anxiety that Type AB is especially prone to given their complex biology.
• Milk Thistle — Supports liver detoxification. Type AB's mixed biology means their detox pathways benefit from support.