You’re standing in the grocery store with a printed list in one hand and your phone in the other, trying to remember if you’re an O or an A, and whether that even matters for what’s in your cart. If you’ve ever started the Blood Type Diet, you know the confusion: one blogger says lentils are great for you, another says they’ll wreck your digestion, and it all seems to hinge on a blood test you took years ago (or never took at all).
The Blood Type Diet was popularized by naturopath Peter D’Adamo in his 1996 book Eat Right 4 Your Type, which proposes that people should eat according to their ABO blood group because each type supposedly reacts differently to lectins (proteins found in many foods) based on ancestral history. It’s worth knowing upfront that the evidence doesn’t back this up. A systematic review published in PLOS ONE and indexed on PubMed Central found no evidence to support the health benefits of blood type diets, and the researchers specifically noted that any weight loss or health improvement reported by followers is likely due to the healthier eating patterns embedded in the diet itself (cutting processed food, added sugar, and excess saturated fat), not the blood type sorting.
So why does this topic still matter enough to write a grocery list for it? Because plenty of people are already following this plan, whether out of curiosity, a doctor’s suggestion for an elimination-style experiment, or simple habit, and they deserve a shopping list that’s organized, realistic, and honest about what the science actually shows. Understanding the food categories the diet recommends for each blood type, and knowing where the evidence is thin, can help you make smarter choices whether you stick with it strictly or just borrow the parts that align with generally accepted nutrition guidance from sources like the Cleveland Clinic.
Key Rules for Following This Diet
Before you fill your cart, it helps to understand the underlying logic of the plan, even if that logic isn’t scientifically validated. Here’s what the Blood Type Diet asks you to do:
- Identify your blood type first. The entire plan is organized around O, A, B, and AB, so you’ll need to know your type (a simple blood test at a doctor’s office or a home kit can confirm it) before building a grocery list.
- Emphasize “beneficial” foods for your type and limit “avoid” foods. Each type has a list of foods considered ideal, neutral, and to be avoided, based on D’Adamo’s theory about lectins and digestion.
- Match exercise to blood type, too. The original plan also recommends specific activity levels (high-intensity for Type O, calming exercise like yoga for Type A, for example), though this article focuses on the grocery and food side.
- Favor whole, minimally processed foods across all types. Regardless of blood type, the diet steers everyone away from heavily processed foods, added sugars, and refined grains, which is the part most nutrition experts agree with.
- Treat it as a framework, not a medical prescription. Because major reviews haven’t found blood-type-specific benefits, it’s wise to view this as a personal eating experiment rather than a scientifically proven intervention, and to loop in a registered dietitian if you have any underlying health conditions.
Grocery List by Category and Blood Type
Below is a practical shopping list broken out by blood type, organized the way you’d actually walk through a store: proteins, produce, grains, and pantry staples. Use it as a starting point and adjust based on your own preferences, allergies, and any guidance from your physician.
Type O: High-Protein, Lean, and Produce-Forward
Type O is considered the “hunter” type in D’Adamo’s framework, and the recommended list leans heavily toward lean animal protein, fish, and vegetables, while limiting grains and dairy.
- Proteins: lean beef, bison, lamb, chicken, turkey, salmon, cod, sardines, mackerel
- Produce: broccoli, spinach, kale, sweet potatoes, onions, garlic, seaweed, artichokes, figs
- Grains and legumes (limited): sprouted grain bread, small amounts of rice, black beans, adzuki beans
- Fats and oils: olive oil, flaxseed oil
- Other staples: walnuts, pumpkin seeds, herbal teas (ginger, peppermint)
Type A: Plant-Forward and Vegetarian-Leaning
Type A is framed as the “agrarian” type, so the list is largely vegetarian, with an emphasis on fresh produce, legumes, and soy-based proteins instead of red meat.
- Proteins: tofu, tempeh, lentils, chickpeas, edamame, eggs (in moderation), salmon, mackerel
- Produce: broccoli, carrots, spinach, kale, garlic, pineapple, blueberries, cherries, apricots
- Grains: oats, buckwheat, rice, quinoa, rye bread
- Fats and oils: olive oil, flaxseed oil
- Other staples: almonds, peanuts, green tea, soy milk
Type B: Balanced and Dairy-Inclusive
Type B is described as more tolerant of a broader range of foods, including dairy, which sets it apart from the other three types on this list.
- Proteins: lamb, mutton, rabbit, venison, cod, salmon, low-fat yogurt, cottage cheese
- Produce: leafy greens, sweet potatoes, beets, cauliflower, bananas, grapes, pineapple, papaya
- Grains: oats, brown rice, spelt bread, millet
- Fats and oils: olive oil
- Other staples: walnuts, low-fat milk and cheese, green tea
Type AB: A Mix of Type A and Type B
Type AB is treated as a hybrid, so the recommended foods pull from both the Type A and Type B lists, generally favoring plant proteins and seafood over red meat.
- Proteins: tofu, lamb, turkey, salmon, mahi-mahi, sardines, low-fat yogurt
- Produce: leafy greens, cucumbers, sweet potatoes, grapes, pineapple, cherries, kiwi
- Grains: rice, oats, spelt bread, millet
- Fats and oils: olive oil
- Other staples: walnuts, peanuts, green tea, soy milk
Foods to Avoid
Just as important as what to buy is what the plan asks you to leave off your list. Again, these restrictions are based on D’Adamo’s original theory rather than rigorous clinical trials, so consider them optional guidance rather than firm rules.
Type O
- Wheat and gluten-containing grains
- Dairy products, including milk and most cheeses
- Corn, cabbage, and cauliflower
- Kidney beans and lentils
Type A
- Red meat, including beef and pork
- Dairy products
- Wheat in large amounts
- Kidney beans, lima beans, and potatoes
Type B
- Chicken (considered a “problem” protein in this framework)
- Corn, wheat, and buckwheat
- Peanuts, sesame seeds, and lentils
- Tomatoes
Type AB
- Red meat and cured or smoked meats
- Chicken
- Corn and buckwheat
- Black beans and kidney beans
Sample Day of Eating
Here’s an example of how a single day might look if you’re following the Type O plan, just to illustrate how these grocery items translate into actual meals. You can adapt the format for A, B, or AB using the lists above.
- Breakfast: two eggs scrambled with spinach and onions, a side of sliced figs, and green tea
- Lunch: grilled salmon over mixed greens with olive oil and lemon dressing, plus a small serving of sweet potato
- Snack: a handful of walnuts and pumpkin seeds
- Dinner: lean grilled chicken or turkey with roasted broccoli and a side of black beans
- Evening: herbal ginger tea
Notice that this sample day, regardless of blood type, looks a lot like standard healthy-eating advice: lean protein, plenty of vegetables, minimal processed food, and modest portions of whole grains. That overlap is exactly why researchers suspect people report feeling better on this diet, the improvements track with cutting processed foods, not with matching food to blood type.
If you try the Type A or AB sample day instead, you’ll notice the plate shifts toward plant proteins like tofu and lentils, with fish appearing more often than red meat. A Type B day might swap in low-fat yogurt at breakfast and cottage cheese as a snack, since dairy is one of the few things Type B is allowed that the other three types are asked to limit or avoid. The point of walking through a full day, rather than just listing groceries, is to show how the restrictions actually play out at mealtimes, and how much they still resemble a basic, balanced diet once you get past the blood type framing.
Meal Prep Tips
If you’re going to commit to shopping and cooking around your blood type, a little planning goes a long way toward making it sustainable.
- Batch-cook your proteins. Grill or roast a large batch of your type’s recommended proteins (salmon, tofu, lamb, or turkey, depending on your list) at the start of the week so you can mix and match with different vegetables each day.
- Wash and chop produce in advance. Since every blood type list leans heavily on fresh vegetables, prepping them ahead of time removes the biggest barrier to actually eating them.
- Portion your grains and legumes separately. Because the “allowed” grains and legumes vary so much by type, cook a base batch of your specific approved grain (rice, oats, or quinoa, for example) and store it in individual containers.
- Keep a running list of your “avoid” foods on your phone. It’s easy to forget which foods are off-limits for your specific type, especially with overlapping items across categories, so a quick-reference note saves time at the store.
- Build in flexibility. Because the science behind strict adherence is weak, don’t stress over occasional departures from your type’s list. Consistency with an overall pattern of whole foods matters more than precision.
The Bottom Line
The Blood Type Diet gives you a structured, easy-to-follow shopping framework, and if you enjoy the organization it provides, there’s no harm in using it as a general guide. But it’s important to go in with clear eyes: the diet’s central premise, that your ABO blood type should dictate which foods you eat, hasn’t held up under scientific scrutiny. The benefits people experience typically come from the diet’s built-in emphasis on vegetables, lean protein, and reduced processed food, the same principles found in almost every evidence-based eating pattern recommended by Harvard’s T.H. Chan School of Public Health. If your goal is genuine, sustainable weight management or better overall health, you’ll likely get there faster by focusing on whole foods, portion awareness, and consistency, with or without sorting by blood type.
Medical disclaimer: This article is for informational purposes only and is not a substitute for personalized advice from a registered dietitian or physician. The Blood Type Diet lacks strong scientific support, and major reviews, including analyses published through the National Center for Biotechnology Information, have found no consistent evidence that eating according to ABO blood type improves health outcomes. Before making significant changes to your diet, especially if you have an existing health condition, are pregnant, or take medication, consult your doctor or a registered dietitian, or review general nutrition guidance at MedlinePlus.
