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You’ve probably heard it before — “People with blood group O+ shouldn’t eat ripe plantains or coconut because it’s bad for their health” or “Certain blood groups should avoid specific foods or else they’ll face complications.” This belief has been around for years, especially in some communities where food myths easily spread by word of mouth.
But here’s the truth: there is no or not enough scientific evidence or research to support these claims. In fact, decades of nutrition research have consistently shown that your blood type does not determine what foods you should or should not eat.
Where Did This Idea Come From?
The popularity of “blood type diets” can be traced back to a book published in the 1990s, which claimed that people should eat according to their blood group to improve health and prevent disease. The theory sounded convincing at the time, but when researchers put it to the test, the results were clear: no credible scientific studies have found any meaningful link between blood group and specific food intolerances or benefits.
A 2013 study published in the American Journal of Clinical Nutrition analyzed these claims and concluded that “no evidence currently exists to validate the purported health benefits of blood type diets.” (Cusack et al., 2013)
Why the Myth Persists
In many cases, people who adopt restrictive diets might feel better, but that’s often because they’ve removed highly processed foods or improved their eating habits generally—not because of their blood type.
Unfortunately, misinformation spreads easily, especially when it’s connected to tradition or passed down through generations. But it’s important to question such claims and look for research-backed evidence.
Let’s Talk About Ripe Plantains and Coconut
Ripe Plantains are rich in fiber, potassium, and vitamins A and C. They’re good for digestion, help regulate blood pressure, and support immune function. They’re beneficial for people of all blood types.
Coconut provides healthy fats, especially medium-chain triglycerides (MCTs), which can serve as a quick source of energy. Like with any food, moderation is key, but there’s no medical basis for avoiding coconut based on your blood group.
If you have a specific medical condition—like diabetes, high cholesterol, or a food allergy—that’s what should guide your food choices, not your blood type.
The Bottom Line
The best dietary advice is the simplest one: focus on balanced, varied meals, rich in fruits, vegetables, whole grains, healthy fats, and lean proteins. Consult a registered dietitian or nutritionist if you need a personalized plan — but ignore claims that your blood type should dictate your plate.
Remember: Food choices should be based on evidence, not hearsay.
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RD, LD Julius Sammah
MyHealthCop Certified Dietician
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