Blood type diet chart: Foods to eat and avoid by type

Found our content helpful?

Key takeaways

A blood type diet chart sorts foods into eat, avoid and neutral lists for each of the four ABO types.

Type O is steered toward lean meat and fish, Type A toward plants, Type B toward a broad list, and Type AB toward both.

Rh factor does not change the food lists, so O positive and O negative follow the same chart.

A 2014 PLoS ONE study found the diets’ benefits appeared regardless of the eater’s blood type.

Anyone with diabetes, kidney disease or heart disease should follow their clinician’s prescribed diet instead.

A blood type diet chart sorts foods into eat, avoid and neutral lists for each of the four ABO blood types. Type O gets lean meat and fish with few grains. Type A gets plant proteins and whole grains. Type B gets the widest list, and Type AB inherits restrictions from both A and B.

The framework comes from naturopath Peter D’Adamo rather than from clinical trials. A 2014 study in PLoS ONE tested it in 1,455 young adults. People following these diets did show better cardiometabolic markers. The improvement showed up regardless of which blood type they carried, so the benefit came from the eating pattern itself.

This page gives you the full chart for all four types, one-day meal plans, and a printable PDF. It also answers the question patients ask most, which is whether Rh factor changes the food lists.

What the diet is based on

The chart comes from Peter D’Adamo’s 1996 book Eat Right 4 Your Type. D’Adamo argued that your ABO blood type decides how well you digest particular foods.

The proposed mechanism is lectins. These are proteins in food that D’Adamo says react with blood type antigens, setting off digestive or inflammatory responses specific to each type. Each chart then sorts foods into three columns. Beneficial foods are encouraged, neutral foods are allowed, and avoid foods are restricted.

All four types at a glance

The master table compares the four types in one place. It shows the primary food emphasis for each, along with the headline inclusions and exclusions.

Read the four lists next to each other and an odd thing surfaces. They overlap far more than the framework’s four-way split suggests, and the overlap is the part every dietitian would already recommend.

Type O: High protein, few grains

D’Adamo calls Type O the hunter. The Type O list leans on lean meats, fish and non-starchy vegetables, and it cuts most grains and legumes.

• Beneficial foods: beef, lamb, venison, halibut, salmon, herring, spinach, broccoli, kale, onions, olive oil
• Foods to avoid: wheat, oats, corn, beans, lentils, peanuts, high-fat dairy
• Sample day: grilled fish with vegetables, then a lean beef salad, then turkey breast with roasted greens

The result looks much like any high-protein eating pattern. If a patient wants more structure, a high-protein diet plan gives them the same emphasis with portion guidance built in.

Does O positive eat differently from O negative?

No. D’Adamo’s framework makes no distinction based on Rh factor, so O positive and O negative follow the same list. Rh status describes whether the Rh antigen sits on your red blood cells. That is a separate genetic trait, and the lectin theory never involves it.

Type A: Plant-based and low fat

Type A is the cultivator in D’Adamo’s scheme, built for plant foods. The list favors vegetables, whole grains, legumes and plant proteins, and it limits red meat and full-fat dairy.

• Beneficial foods: tofu, tempeh, legumes, whole grains, vegetables, fruits, olive oil, green tea
• Foods to avoid: red meat, chicken, high-fat cheese, butter, corn oil, caffeine
• Sample day: oatmeal with berries, then lentil soup with spinach, then tofu stir-fry with brown rice

Patients who want a longer runway can follow a plant-based diet plan instead, which covers the same food groups across a full month.

Does A positive eat differently from A negative?

Rh factor makes no difference here either, exactly as with Type O patients. Rh status sits at a genetic locus separate from ABO, so it plays no part in the proposed lectin mechanism. A positive and A negative patients get identical guidance.

Type B: The most flexible list

Type B is the nomad, and this list restricts the least. Animal protein, low-fat dairy, vegetables and grains are all on it, alongside a short set of specific exclusions.

• Beneficial foods: red meat, fish, eggs, low-fat dairy, vegetables, grains, olive oil
• Foods to avoid: chicken, corn, lentils, peanuts, sesame seeds, shellfish
• Sample day: eggs with whole grain toast, then lamb with sweet potato, then salmon with quinoa and vegetables

Type AB: A mix of A and B

Type AB is the rarest of the four, and D’Adamo calls it the enigma. The list carries restrictions from both parent types, so it balances plant and animal foods while excluding what A and B each rule out.

• Beneficial foods: tofu, fish, eggs, low-fat dairy, vegetables, whole grains, olive oil
• Foods to avoid: red meat, chicken, corn, caffeine, smoked meats, excess alcohol
• Sample day: yogurt with fruit, then tofu salad with grains, then white fish with roasted vegetables

What the science says

No controlled evidence supports blood-type-specific benefits. The most-cited test is a 2014 PLoS ONE study of 1,455 young adults. Researchers scored how closely each person ate to each of the four diets.

Several of those eating patterns did track with better cardiometabolic markers. Matching the diet to the person’s own blood group changed none of those associations. The authors concluded that their findings do not support the blood type diet hypothesis.

That result is more useful than a flat debunk. The Type A list may well help someone, though not for the reason D’Adamo gives. The food is doing the work, and the antigen is incidental. Look at the four lists again and the common core stands out. Vegetables and olive oil appear on every one, and corn is restricted on every one.

The lectin mechanism has never been demonstrated in a controlled setting either. No trial has shown food lectins binding blood type antigens and producing the effects D’Adamo describes.

Weight loss practices field this question more than most, because patients arrive with the chart already printed. The honest framing is that it is one way to structure food choices, and that the research does not put it above other structures.

One caution worth repeating. Patients with diabetes, kidney disease, heart conditions or food allergies should follow the diet their clinician prescribed. A blood type chart is patient education, never medical nutrition therapy.

Sample meal plans for each type

A one-day plan shows patients how the lists turn into meals. The table below puts all four side by side.

Swap items freely for foods the patient already buys. Adherence climbs when the example looks like their own kitchen and their own cooking.

How to use the chart with patients

Five steps turn the chart from a printout into part of the consultation. Start by capturing the blood type itself, ideally on a nutrition assessment form the patient fills in before they arrive.

1. Confirm the blood type at intake. Ask for the patient’s ABO and Rh type, or arrange a test. Record it so later visits do not repeat the question.
2. Introduce it without prescribing it. Say it is one way some patients like to structure food choices. Be clear that the evidence is thin.
3. Hand over the PDF. Patients use the chart at the grocery store, not in the consulting room, so they need a copy they can carry.
4. Check in at the follow-up. Ask about digestion, energy and any markers you track. Adjust the guidance to what the patient reports.
5. Refer when a diagnosis is involved. Diabetes, kidney disease, heart conditions and food allergies all need a registered dietitian and a prescribed diet.

Write the conversation down the same day. A nutrition SOAP note keeps the advice you gave, the patient’s response, and your plan in one place for the next visit.

How Pabau keeps nutrition plans on the patient record

Most practices run this across three disconnected tools. The blood type lands on a paper intake form. The chart goes out from someone’s inbox, and the follow-up note sits in a separate document.

Practice management software like Pabau puts the three in one place. Digital intake forms capture the blood type before the appointment, so it is on the record by the time the patient sits down.

From there you can email the chart from inside the record and set a follow-up reminder. The nutrition note goes against the same patient file. There is no rekeying, so you can spend the follow-up talking instead of hunting for last visit’s advice.

Keep dietary plans on the patient record

Pabau’s digital intake forms capture a patient’s blood type before the visit, and client records hold the chart you sent alongside your follow-up notes. Your nutrition advice stays with the patient instead of in an inbox.

Book a demo

Conclusion

The chart is worth handing to a patient who wants one, as long as you frame it honestly. It gives structure to people who find food decisions hard, and structure is half of why any diet works.

The trade-off to remember is the restriction. A Type O patient who drops grains and legumes loses fiber and cheap protein. A Type A patient who drops red meat loses a good iron source. Neither trade is justified by the blood type, so neither should be made without a reason you can defend.

Whatever chart you hand out, the value shows up in the follow-up rather than in the printout. Book a demo to see how Pabau keeps a patient’s blood type, the chart you sent and your follow-up notes on one record.

Continue your research

Want a quick reference for food groups and portions? Nutrition cheat sheet condenses the guidance you repeat in every consultation onto one printable page.

Need patients to record what they eat between visits? Nutrition worksheet gives them a structured place to log meals, portions and how each one made them feel.

Measuring progress beyond the scale? Body mass index assessment covers what BMI does and does not tell you about a patient’s metabolic health.

Documenting a dietitian consultation? ADIME note template walks through assessment, diagnosis, intervention, monitoring and evaluation in the order a reviewer expects.

Frequently asked questions