The Bieler System

This was the first endocrine typing system, developed by Henry G. Bielei, M.D., and based on European research. His body types (the Thyroid Type, Pituitary Type, Adrenal Type) were based on an individuai 's dominant gland. Bieler further developed the first modern process to directly match body type to diet pattern. Bieler's diet therapies were partly based on the works of Hippocrates and Sir William Osler. The Bodytype Diet and Lifetime Nutrition Plan by Dr. Abravanci is what most would term a "trendy" weight-loss version of Bieier's work.

Endocrine glands have been shown to control many aspects of body shape and personality. Examples of this include the pituitary and thymus that control growth hormone which in turn effects many factors of immunity, size, shape, fat deposition, etc. The adrenals control muscle development and energy and oxidation levels. The thyroid gland exerts an influence on mental function and controls the metabolic rate overall helping to inhibit fat accumulation. Various nutrient needs are connected to the production of hormones exemplified by the thyroid 's need for iodine, tyrosine, and B6, and in the pancreas' special need for zinc and protein. Glandular function is also connected to digestion through digestive enzyme production and intestinal motility.

Shortcomings in Bieler's work were apparent only due to the fact that, at the time of his research, the functions of all the endocrine glands were not known.