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What is a Mesomorph?

Sheri Cyprus
Sheri Cyprus

A mesomorph is a muscular body type. It's one of three body types put forth in theory by William Sheldon in his book, The Atlas of Men, published in 1954. According to Sheldon, an American psychologist, the three possible body types for human beings are: mesomorph, ectomorph, and endomorph. Endomorphs are rounder and don't burn fat easily, while ectomorphs are slim and have fast metabolisms that enable them to burn fat quickly. Mesomorphs are considered to be the ideal body type as they tend to be able to maintain their correct body weight and are usually well proportioned.

Female mesomorphs have hourglass figures, while their male counterparts are rectangular in shape, with broad shoulders and a slim waist. A person with the mesomorph body type is muscular and tends to have shapely arms and legs. The bones in the face tend to be prominent. Mesomorphs are said to have wider faces than the other two body types. According to Sheldon, people with a mesomorph body type tend to have coarse rather than fine hair, good posture, and thick skin that tans easily.

Mesomorphs generally find it easy to build muscle.
Mesomorphs generally find it easy to build muscle.

Although the mesomorph has a natural, muscular fitness, he or she isn't likely to stay that way naturally. The aging process tends to slow down the mesomorph's efficient fat burning metabolism. Younger mesomorphs are usually able to eat whatever foods they want without gaining weight, but this characteristic tends to change as they age, unless they exercise regularly. Even older mesomorphs tend to be able to lose weight as easily as they gain it, though.

Mesomorphs are able to lose weight easily.
Mesomorphs are able to lose weight easily.

Too much fat in the diet tends to show in a fast weight increase in people with the mesomorph body type. Mesomorphs gain weight much more easily than naturally lean ectomorphs, although they also have the ability to lose it much faster than full figured endomorphs. Since mesomorphs also gain muscle easier than the other two body types, regular exercise can keep this type looking fit as long as the dietary fat intake remains moderate. Of the three body types, mesomorphs are the most likely to have and maintain a body that is height and weight proportionate.

Weight lifting is considered part of a good work out regimen for mesomorphs. Not only are they naturally muscular, but their bones tend to be large and strong. Although the mesomorph is the most athletic body type, caution should be taken not to overdo exercise or weight training. Otherwise, the muscles may be overly strained, which can lead to pain problems.

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Discussion Comments


A lot of the time I feel like these sorts of categorizations are pretty arbitrary.

This one seems that way. While I'm sure there are people who find it easier to gain muscle, I'd question whether that is a factor of being a "mesomorph" or whether it is a mental thing. Maybe they just like exercise. Maybe they prefer steak to potato chips.

Also, if you want to build muscle, I think you can whether you have this body type or not.

I don't mean that being able to put people into these groups can't be helpful.

But, when it means some people feel like they belong to a particular group and can't change even if they want to, when I think it goes too far.


Another concern for people with a mesomorphic body type is their heart health.

There was a scientific experiment a while ago where they managed to create mice with huge amounts of muscle.

The mouse died early of a heart attack. Having too much muscle is almost the same as having too much fat, but can be even harder on your heart.

I'm talking about people who have massive muscles, like weight lifters.

And of course, there are benefits to this as well.

But, do keep in mind that too much muscle can tire out your heart before its time.

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    • Mesomorphs generally find it easy to build muscle.
      By: theartofphoto
      Mesomorphs generally find it easy to build muscle.
    • Mesomorphs are able to lose weight easily.
      By: jedi-master
      Mesomorphs are able to lose weight easily.