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Because most anthropometric formulas such as the Durnin-Womersley skinfold method,  the Jackson-Pollock skinfold method, and the US Navy circumference method, actually estimate body density, not body fat percentage, the body fat percentage is obtained by applying a second formula, such as the Siri or Brozek described in the above section on density. Consequently, the body fat percentage calculated from skin folds or other anthropometric methods carries the cumulative error from the application of two separate statistical models.
Grams of protein per day - This value is calculated from the maximum normal BMI, your height, and your level of activity. It corresponds to grams of protein per Kilogram of body weight which is the Recommended Dietary Allowance (RDA) for low levels of activity, grams for moderate activity, and grams for vigorous activity. Other components of the diet, including essential fatty acids and carbohydrates should be proportioned to provide the minimum required Calories per day. For men and women of equal height the caloric requirements are lower for women, but the protein requirements are the same for both men and women. This means that, in general, women's diets should be richer in protein than men's diets. Any diet should always include at least the minimum amount of protein to prevent loss of muscle tissue when the caloric intake is reduced. A typical high-protein diet would derive 30% of the Calories from protein, 30% from fat, and 40% from carbohydrate. A low carbohydrate weight-loss diet generally derives 25% of the Calories from protein, 65% from fat, and 10% from carbohydrate. The tables below show that these percentages provide more than the minimum protein requirement for 2000- and 1800-calorie diets. The . Government Recommended Diet is used as the basis for the "% Daily Values" that are listed on the "Nutrition Facts" labels in food products.