PT on the Net Research

Metabolic Typing


What exactly is metabolic typing and how does it apply to diet and the training arena?


Metabolic Typing (MT) is the direct result of decades of independently funded research, drawing its initial roots from Dr. Roger Williams's work in Biochemical Individuality.

In 1956 Williams wrote a very important work, Biochemical Individuality, which exposed how human beings are very different on every different level (cellular-->tissue-->organ-->system). These genetic differences - biochemical individuality - are the essence of Metabolic Typing! The following excerpt is drawn directly from The Metabolic Typing Diet by Wolcott & Fahey.

Metabolic typing is based on the fact that over thousands of years of evolutionary history, people in different parts of the world developed very distinct nutritional needs (biochemical individuality), in response to a whole range of variables, including climate and geography and whatever plant and animal life their environments had to offer. As a result, people today have widely varying nutrient requirements, especially with regard to MACRONUTRIENTS - the PROTEINS, CARBOHYDRATES, and FATS that are the fundamental dietary "building blocks" most essential to sustaining life. We all need a full spectrum of nutrients. But, different people have genetically programmed requirements for different amounts of various nutrients. It is these differing genetically based requirements that explain why a certain nutrient can cause one person to feel GOOD, have NO EFFECT on another, and cause a third person to feel WORSE.

The bottom line is this: Unless you acquire all the nutrients for which you have a genetically programmed need, your cells’ ability to perform their functions will be impaired! When you eat according to your own unique hereditary requirements, as opposed to following some universal dos and don’ts or randomly prescribed dietary advice, it’s entirely possible that you can... ...


  • Strengthen your immune system
  • Achieve and maintain your ideal weight
  • Optimize physical energy and mental clarity
  • Overcome mood swings and depression
  • Enhance athletic performance and endurance

There’s no single greater influence on your health than the food you eat several times a day, every single day of your life. One must first identify the specific raw materials that will support the body’s unique biochemical requirements, and then supply them in the right combinations. Then, simply step aside and let your body repair, rebuild, and regulate itself!

Metabolic typing is based on the synergy of the body’s nine fundamental homeostatic control mechanisms (FHC’s). These nine FHC’s regulate all the biochemical reactions taking place in the body at any given moment. All chronic diseases have one thing in common: They involve an imbalance in one or more of these control mechanisms.

Wolcott’s research has shown the most influential of these mechanisms to be the OXIDATIVE SYSTEM (i.e., slow, fast, mixed), and the AUTONOMIC NERVOUS SYSTEM (i.e., sympathetic, parasympathetic, balanced). Thus, a convenient testing system was developed to aid in determining which of the THREE BASIC METABOLIC TYPES one might be:

There is plenty of room for individuality within the context of each of these basic categories. For example, one protein type may experience optimal health consuming 45% PROTEINS, 35% CARBS, & 20% FATS, while another protein type may experience optimal health consuming 55% PROTEINS, 20% CARBS, & 30% FATS! It is also very important to note that not only are the RATIOS of PROTEINS/CARBS/FATS important to consider, but also the TYPES. For example, protein type individuals are generally recommended to consume primarily NON-STARCHY vegetables for carbs.

Conversely, carb types can do well on some starchy higher glycemic carb sources.

All in all, it would be wise for anyone whose goal is optimal health and vitality to at least discover what their basic metabolic type is. This can be done by taking the 64 question written test in Wolcott's book, or by going online and contacting Healthexcel (see below).

For a free condensed version of the Metabolic Typing Self-test in Wolcott's book, please go to the following link: Dr. Mercola - an expert in natural and alternative medicine techniques - has posted this test for FREE on his web site ( The results are automatically tabulated and an explanation is given! This is an unbelievable opportunity - CHECK IT OUT!

Be Healthy,

Noah Hittner, BS, CHEK-NLC Level II, PES, RTS, CPT
Founder - "FOUR HEALTH" Nutrition, Fitness, & Lifestyle Coaching