How many calories are in 1 gram of protein?

In nutrition, protein is a crucial macronutrient that provides energy, and it is widely accepted that each gram of protein delivers approximately 4 calories. This value is important for calculating the total caloric intake from protein sources in a diet. Understanding this caloric value helps individuals make informed decisions regarding their macronutrient distribution and helps in meal planning, especially for those looking to manage their weight or focus on specific dietary goals. The 4-calorie measurement is grounded in scientific research and is a standard used in dietary guidelines and food labeling.