The Blood-Type Diet, Explained

You Should Know: The ‘90s bestseller Eat Right 4 Your Type claims that your ABO blood type dictates the foods and workouts that suit you best. Nearly 30 years later, the idea is resurfacing on TikTok — despite a lack of supporting evidence.

Going Deeper: 

The plan maps four templates:
– Type O: high-protein foods; vigorous aerobic exercise
– Type A: mostly vegetarian; gentler exercise 
– Type B: a broad variety including dairy
– Type AB: a mix of A and B guidance

More than a decade after publication, a systematic review found no evidence to support its claims. Later, a large study tested the diet’s core claims and found that reported benefits weren’t tied to blood type. 

Proponents argue that a lack of evidence doesn’t prove the diet lacks merit. Still, most experts agree that calorie control, reducing ultra-processed foods, and an emphasis on whole, minimally processed foods likely explain any weight loss or health improvements people report. 

Takeaway: The “secret” isn’t your blood type. It’s portion control, and a focus on whole and healthy foods.