You might've heard of the blood type diet popularised in the 90s off the back of a best-selling book.

It’s based on the theory that blood types emerged at different times in history, when our ancestors had very different diets.

So does that mean certain foods are better for an A-, an AB+ or even an O-?As Norman and Tegan explain, it’s a complicated story.

References:

• Blood type diets lack supporting evidence: a systematic review
• Blood Type Is Not Associated with Changes in Cardiometabolic Outcomes in Response to a Plant-Based Dietary Intervention
• Genetically Determined ABO Blood Group and its Associations With Health and Disease

• The Role of ABO Blood Type in Patients with SARS-CoV-2 Infection: A Systematic Review