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The systems are believed to provide some guidance to creating medical, nutritional, psychotherapeutic, or exercise programs for the person so classified. The classification systems include:
- Humours (Ayurveda)
- Somatotype of William Herbert Sheldon
- Paul Carus's character typology
- Ernst Kretschmer's character typology
- Elliot Abravanel's glandular metabolism typology
In the case of certain medical disorders, there are well-established links between body characteristics and susceptibility. The value of the general typologies is not as well established despite their long histories.