A person who endeavors to not include any animal products in their diet. Well-planned veganism is a healthful and satisfying lifestyle.
Spring 2009: Different Diets for Different Types?
Author: Dr. Rudy Davis, N.D.
Publish date:

The book Eat Right For Your Type by Dr. Peter J. D’Adamo is based on the premise that different blood types require different diets in order to be healthy.i The dietary recommendations vary from meat-based to plant-based. They are based on the four human blood types: A, B, AB, and O. The book raises questions, especially for some vegetarians who are told they are in a blood group that requires a flesh-food diet. It also raises a question for those who follow the vegan “Genesis 1:29” diet, which is the original diet that God gave to humans.

Is it possible that there are vegetarians who would do better consuming animal products? Are there some people who should be consuming more dairy products than others? Are some of us, because of our blood type, not meant to be vegetarian? And, if this is true, then why did God originally give the human family a plant-based diet?

Advice from the Bible and Science

Although the Bible says nothing about blood types or about different diets for different blood types, it does contain principles that can help us answer these questions. The Bible indicates that we should “ask now the beasts, and they shall teach thee” (Job 12:7). Let’s take a look at the beasts and see if their existence can help us unravel this dietary dilemma.

Have you ever noticed how all cattle in a field eat the same thing? If they all have the same blood type, then the Eat Right for Your Type diet may have some solid ground on which to base its theory. However, cattle have eleven different blood groups: A, B, C, F, J, L, M, R, S, T, and Z, according to Drs. M. E. Davis and H. C. Hines (directors of the Animal Genetics Lab at Ohio State University). The B group alone has sixty different antigens.ii

Cattle not only have more blood types than us, but also more complicated blood types. Each bovine system comprises factors (between 1 to 35 +) which are combined to produce phenogroups.iii One thousand phenogroups have thus far been observed, and these phenogroups, according to Davis and Hines, can be combined to produce over 10 billion blood types in cattle.

Considering the amazing amount of different blood types in cattle, and how they all eat the same foods, Dr. D’Adamo’s theory seems incorrect. But let’s gain some more insight before drawing solid conclusions.

What about other animals such as horses? Horses have eight different blood types, and all horses eat the same foods. In fact, throughout all nature, animals of the same species eat the same foods and they all have many different blood types within the same species. “Ask now the beasts, and they shall teach thee.”

My Lab Experience

In my office, I have examined all the different blood types in humans and have had to deal with all of the common diseases that afflict North Americans. I have given them all the same plant-based diet, and as they have followed my recommendations (based on Genesis 1:29), I have watched them go from sick to healthy in a relatively short time period.

Before and After

Notice the pictures above, which I took myself. All of these photos were taken before and after adopting the Genesis vegan diet from an animal based diet. The time span between each photo was just ten days. In order for the blood to be healthy and keep the body healthy, it has to flow freely throughout the whole system.

As you look at the “before” photos in each set, you will see that the blood cells are sticking together due to the kind of diet (animal products and highly processed foods). These are not isolated incidents, but rather a mere few from hundreds of personal case studies including every human blood type, and the results are the same. Notice how singular the blood cells have become in the “after” pictures of each set. This means that the person’s circulation and blood health has greatly improved. “Perfect health depends upon perfect circulation" (Christian Temperance and Bible Hygiene, 90).

We must understand that the Eat Right for Your Type diet is not based upon the Word of God, but parallels Darwin’s theory of evolution. The book promotes the premise that we have descended from the “O” type blood group.

On page 14 D’Adamo states, “The blood types were not a hit or miss act of random genetic activity. Each new blood type was an evolutionary response to a series of cataclysmic chain reactions, spread over ions of environmental upheaval and change.”

Dr. Michael Klaper, MD, a world-renowned health authority and promoter of the vegan dietary lifestyle, had this to say,

In my opinion, D’Adamo has spun an evolutionary fairy tale that leaves many unanswered questions.

Dead-end Streets or a Straight and Narrow Path?

Scripture clearly states that in the beginning, God gave a plant-based diet to all humankind. As a Christian, I believe that God, seeing the end from the beginning, knew what would be best for His children. He considered our health in a disease-filled world at the end of time and chose the food that would be best for us.


Woe to the rebellious children, saith the Lord, that take counsel, but not of me (Isaiah 30:1).

Life without God becomes very complex, confusing, stressful, and unexplainable. To live outside the acknowledgment of God and His wisdom is to live in search of something that will protect you from the inevitable results of disobedience to His life-giving laws. This can only lead to wrong conclusions and eternal ruin.

A dead-end street can wind in many directions and even seem like it is going somewhere. In the absence of God’s instruction, life becomes a series of dead-end streets, some longer than others. All of them end in confusion, as we have seen with the Eat Right for Your Type theory.

With God there are no dead-end streets, for His ways go on forever with no end. All of God’s ways are found in His Word. When theorists don’t consult Scripture, they are merely creating more dead-end streets.

There is a way that seemeth right unto a man, but the end thereof are the ways of death (Proverbs 16:25).

Beside Me there is no Saviour (Isaiah 43:11).

Just as God, in His wisdom, designed one diet for all types of blood, God, in His sacrificial love, designed only one remedy for all types of sin. That remedy is Jesus Christ.

If you are searching for peace and truth, try God’s path. The diet He gave to our first parents produces the greatest health of any diet in human history. This shows us that His laws were created with life in mind. I have come to trust the directions and truths contained in the Bible, for they really are “a lamp unto my feet, and a light unto my path” (Psalm 119:105).

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i Peter D’Adamo, Eat Right For Your Type (Putnam, 1997).

ii Antigen : all cells, whether foreign to or part of the body, carry an antigen , or marker, which identifies the cell (such as a kidney cell or lung cell). Antigens on cells that are normal body cells are called autoantigens. Antigens on all other cells that are not normal body cells are called foreign antigens.

iii Phenogroup: a group of alleles that are always inherited in groupings of two or more. An allele is one member of a pair, or series of genes, that occupy a particular position on a specific chromosome.   

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