How many calories are in one gram of protein and carbohydrates?

• A. 3 calories
• B. 4 calories
• C. 5 calories
• D. 6 calories

Answer: (B)

In nutrition, both protein and carbohydrates provide energy at the same rate, which is four calories per gram. This is a standard figure recognized in dietary guidelines and is crucial for understanding energy intake from these macronutrients. Each gram of protein or carbohydrate contributes four calories to the diet, which plays a significant role in calculating daily caloric needs and macronutrient distribution for health and fitness goals. Knowing this allows for better dietary planning, especially for individuals aiming for weight management or specific nutritional targets. The other options (3, 5, and 6 calories) do not accurately reflect the established caloric value for protein and carbohydrates, which is why they are not considered correct answers.