Does the blood type diet work?

So many people are discovering that a high animal-protein diet helps them lose weight and feel good, even reducing the effects of illnesses or making them disappear altogether. This works – I know – I tried it before I became a vegan, again.

It helped me lose the weight I had gained (which happened every time I tried to be vegan). It also made the arthritis, chronic fatigue syndrome, fibromyalgia, and strange shivery and heated spells go away. It also healed my liver and adrenal system.

I was a mess, but eating fish, eggs and vegetables brought me back to life.

So why have I brought this subject up on a blog that advocates eating plant-based food only?

The blood type diet helps me to be a healthy vegan

I tried to be vegan again after healing myself on the high animal-protein diet, as ethical eating is vital to my emotional well-being, but I found I was having trouble keeping my weight down, again. I got fat and felt perpetually tired, making me crave fatty and sweet foods for energy. I was sleeping up to ten or even twelve hours a night and waking exhausted.

A picture of a loaf of bread and wheat stalks

Wheat contains lectins

I finally discovered what my problem was by checking out the blood type diet,  created by Dr Peter D’Adamo: certain foods including legumes and grains disagree with me as they contain lectins that my blood reacts to as if they are poison, causing me to feel exhausted and to consequently eat too many nuts, seeds and grains in an attempt to get more energy.

The blood type diet information educated me as to which grains and legumes weren’t toxic to my particular system, so I could eat more of them and cut down on nuts and seeds, some of which I discovered were also toxic for me.

I lost the water I had started to retain as a result of the lectins in certain foods (wheat, mung beans and lentils are bad for me), and I lost the fat I had gained through eating too many nuts and seeds (cashews and sesame seeds are bad for me). I also started to sleep for eight hours again, and feel energised on waking.

I have noticed on various forums and websites many people saying they ‘don’t believe in’ the blood type diet. It’s not clear whether or not they have tried it, but I would hazard that they either have not, or are already eating foods that agree with them, so have had no opportunity to spot the difference.

Changing to this diet has had such a profound effect on my health that I fully endorse it and will remain on it indefinitely. I realise why I have struggled to maintain my health through the many years I tried to be a vegan (since the age of twelve). I was simply eating the wrong food and kept having to return to an animal-based diet to recover. I wish I had known about this blood type diet then….

How does the blood type diet work?

Peter D’Adamo spent years testing foods against the four different blood types, A, B, AB and O. His theory is that the different blood types originated in different regions and ages, and therefore the foods that were eaten at the time in each region/age by peoples of a particular blood type are what is suitable for those who have that blood type now.

For example, he maintains that O blood type is the original type and originated in Africa. This means that the people were hunters and gatherers, so their diet would have consisted of meat, fish, eggs, fruits, green leaves and roots. This would equate to how people ate in the Palaeolithic era.

Here is a video of what life might have been like for the original O blood type people:

Blood type A people were those who settled and grew crops of grain and vegetables, and kept fruit trees and some domesticated animals. This was the Neolithic age. This video shows what this life might have been like:

B blood type people were nomads, travelling the deserts with their camels, sheep and goats that they used for meat and milk, and foraging for vegetables and fruits. This appears to have been the transitional stage between the paleolithic and neolithic eras, where animals were domesticated, but people didn’t settle anywhere long enough to support an agricultural lifestyle. This video shows how nomads live today:

Blood type AB seems to be a cross between A and B, making these people struggle to find foods that they can digest.

D-Adamo tested foods for these blood types and discovered that each blood type reacts to the lectins or other components of various foods in different ways. These tests proved his theory of the geographic origins of the blood types in that O blood type thrives on meat and vegetables but should avoid grains, A blood types are good with grains but should eat little meat, B blood types are the only ones that manage to digest dairy properly and thrive on the meat of sheep, while AB blood types have inherited the traits of both A and B blood types, which are quite opposite in their responses, making life rather difficult for them.

You can check here which foods are beneficial and which foods to avoid for your blood type.

How does this affect vegans?

The first question I asked when I read about lamb and rabbit being beneficial to me in this diet,and that I should avoid many grains, legumes, seeds and nuts, was: how can I be a vegan and survive?

Then I looked more closely at the list of foods and saw that if I was careful and stuck to only those foods that are beneficial or neutral for me, I would still be able to eat a good variety of foods and remain healthy. You can check this out for yourself.

Peter D-Adamo addresses the question of O blood types being vegetarian, in this video:

Obviously, what he is saying is be careful when you go vegetarian or vegan that you don’t compromise your health, and I agree. Being a healthy vegan takes a structured and knowledgeable approach to food. However, I think people sometimes imagine that O and B blood types eat mainly meat, and this is often the impression given on some websites and blogs advocating the Palaeolithic diet.

This is something I disagree with. Paleolithic man, as we discussed previously, would have struggled to get a lot of meat to eat. He would have eaten mainly vegetable foods, so I don’t believe that it is the meat component that keeps non-vegetarians healthy. I believe that it is just supplementary to the diet and can be replaced with carefully chosen plant-based food. What keeps us healthy is eating foods to which our bodies react positively.


Is the blood type diet natural and ethical?

Yes, as I see it, the blood type diet is natural as it encourages us to eat what our ancestors did. It is also better than just following the diet of Palaeolithic and Mesolithic man as it is more specifically tailored to our ancestors’ geographic origins, and therefore our own bodies.

It is also ethical (if we follow the rest of our ethical rules) in that it is good for us – it makes us thrive, feel good and be healthy and disease free.

When I start posting recipes, I will flag them according to blood type .

Have any of you tried the blood type diet? Has it helped? Or made no difference? Please let me know your thoughts.

Next post: High protein or carb?



“Bread And Wheat” by Mister GC on



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