An eclectic (read, non-scientific) method proposed by Nicholas J Gonzalez, MD, for classifying humans into broad categories based on metabolic types created by Gonzalez.
Per Gonzalez, sympathetic dominant types should eat a primarily–80% vegetarian diet; parasympathetic dominants should consume primarily fatty meats, and dairy products–50% of total in their diet. There are no peer-reviewed studies to even vaguely suggest metabolic typing has any validity.
• Sympathetic dominant Those with an efficient sympathetic nervous system
• Parasympathetic dominant Those with an efficient parasympathetic nervous system
• Balanced type Those whose sympathetic and parasympathetic nervous systems are in complete balance