Is Greek yogurt good for blood type O?

Is Greek Yogurt a Good Fit for Blood Type O?

For those following the blood type diet, especially individuals with type O positive, the answer is clear: dairy may do more harm than good. According to Dr. Peter D’Adamo, the proponent of this dietary theory, people with blood type O often struggle to digest lactose, the natural sugar in milk and many dairy products. That includes Greek yogurt, despite its popularity for high protein and probiotics.

The blood type O diet emphasizes lean meats, seafood, and plenty of vegetables while steering clear of dairy, wheat, and legumes. D’Adamo believes that type O individuals evolved as "hunters," thriving on high-protein, low-carbohydrate diets. Introducing dairy—especially lactose-rich varieties—can disrupt digestion and potentially lead to inflammation, bloating, or fatigue.

While Greek yogurt is lower in lactose than regular yogurt due to its straining process, it's still a dairy product. For strict followers of the blood type O plan, even small amounts may interfere with digestive health and long-term wellness.

That said, the blood type diet remains controversial in the scientific community. There’s limited clinical evidence supporting its effectiveness, and many experts argue that blanket dietary rules don’t account for individual variation. Still, if you're type O and notice discomfort after consuming Greek yogurt or other dairy, it may be worth reducing or eliminating it to see if symptoms improve.

Ultimately, listening to your body matters more than any dietary theory. If you’re aiming to follow the type O guidelines, choosing non-dairy alternatives like coconut or almond-based yogurts could be a better fit—offering gut-friendly probiotics without the potential downsides of lactose.