How many calories are found in 1 gram of carbohydrates or proteins?

One gram of carbohydrates or proteins provides a consistent energy yield of 4 calories. This value is fundamental to nutritional science and is widely accepted for understanding dietary energy contributions. Both carbohydrates and proteins are macronutrients required for various bodily functions, and their caloric value reflects their role as energy sources in the diet.

In terms of metabolism, carbohydrates are primarily used as a quick energy source, while proteins are vital for growth, repair, and maintenance of body tissues. The energy density of 4 calories per gram for both nutrients highlights their importance in meal planning and caloric intake for dietary balance.

In contrast, other options such as 5, 6, or 7 calories are not recognized as standard measurements in nutrition for carbohydrates or proteins, leading to misconceptions about their energy contributions. Thus, understanding this specific caloric value is essential for proper dietary guidance and nutritional education.