Nutrition Diet: What is the 4 9 4 rule? Understanding Macronutrient Calories
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4 min read
According to the U.S. Food and Drug Administration, most food manufacturers in the United States use a standard calculation known as the Atwater system to determine the calorie content on nutrition labels. The 4 9 4 rule is a simplified version of this system, providing a straightforward method for understanding the energy density of the three primary macronutrients: carbohydrates, protein, and fat.
