Nutritional guidance is given in a lot of different ways; however, most are done so by using inaccurate calculations that were not tested for individual differences. How our body is functioning will determine the primary fuel source it uses for the energy demands.
For example, it is possible for one person to rely on a high percentage of carbohydrates to supply energy for their body while another person relies on a high percentage of fats to supply energy. The nutritional guidance for each of these people would need to be different.
The most accurate non-invasive technique to get the required data to make this decision is through cardio-metabolic analysis. With this test we are able to measure the percentage of fats versus carbohydrates the body is using for energy, resting metabolic rate, total daily energy expenditure, speed of metabolism, and more!