In 1956, a doctor named Roger Williams wrote a book that stated that all human beings are different and their dietary needs and metabolism are different too. Your body’s autonomic nervous system can be broken down into two systems – sympathetic system and the parasympathetic system. Human beings get influenced by one of these systems over the other one. Certain nutrients are responsible for triggering these systems. There are several types of metabolic typing diet.

They are:

  • Fat-Protein Efficient – On the basis of this diet, your body is the strongest when it is in the parasympathetic system. As a result, carbohydrates get oxidized faster. So, if you have a high-carbohydrate diet, it can have detrimental effects on the fast oxidizers’ energy production. So, you might experience fatigue. Tiredness, and frequent hunger. If you are taking a diet with high protein and fat content, it will help in balancing energy production. So, a fat-protein efficient diet mainly consists of higher protein foods like seafood and red meat. As stated in david sinclair diet, food that has high protein content but fewer calories can help you stay fuller for an extended period. You just need to eat less but more frequently. Diets like the Keto diet and Atkins diet are based on this exact same principle. Several celebrities follow these types of diets. if the focus is more towards saturated fats, there are certain risk factors associated with this type of diet including cardiovascular risk, increased inflammation, elevated levels of cholesterol, etc. These risks can be avoided if the focus is more on unsaturated fats. Some examples of foods that have a high unsaturated fat content are – olive oil, nuts, avocado, etc.
  • Carbohydrate Efficient – On the basis of this diet, your body is the strongest in the sympathetic system. So, you will have to consume foods that have high carbohydrate content for strengthening the parasympathetic branch. According to this diet type, you are required to consume a low-protein and low-fat diet and your diet must include a lot of whole grains, vegetables, and fruits.
  • Mixed Efficient – When a person has a balance of both the sympathetic and parasympathetic branches of the autonomic nervous system, then they can follow this diet type. This diet is a mix of carbohydrates, fat, and protein.

Diet Choices

Fat-Protein Efficient – Limited carbohydrates, whole-fat dairy, seafood (salmon, tuna), dark meat (turkey, chicken), and red meat (lamb, steak, pork).

Carbohydrate Efficient – Limited protein and fat, low-fat dairy, lean meat (like chicken breast, etc.), fruits, and vegetables.

Mixed Efficient – Mixture of both the diets with minimal restrictions.


The focus of the metabolic typing diet is more on the holistic approach to overall health, compared to the traditional approach. A metabolic typing diet has several health benefits, like reversing chronic disease, etc. Experts claim that instead of opting for traditional medication, you can cure hypertension by simply adjusting the distribution of macronutrients in your diet. Although there isn’t any constructive evidence to these claims, you can surely give it a try. Some other benefits include – sustained energy throughout the entire day, mental clarity, increased athletic performance, removal of depression and anxiety, removal of digestive issues, weight loss, etc.

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