One gram of Protein gives us how many Calorie ?

Question

Accepted Answer

One gram of protein provides 4 kcal of energy, which is why Option 3 is the correct answer. This is a well-established fact in the field of nutrition. Proteins, along with carbohydrates, are macronutrients that provide 4 kcal per gram, while fats provide 9 kcal per gram. This caloric value is based on the energy released when the macronutrient is metabolized in the body.

Now, let's examine why the other options are incorrect:

1. **Option 1: 9 kcal** - This option is incorrect because 9 kcal per gram is the caloric value for fats, not proteins. Fats are more energy-dense than proteins and carbohydrates, which is why they provide more calories per gram.

2. **Option 2: 2 kcal** - This option is incorrect because no macronutrient provides 2 kcal per gram. Both proteins and carbohydrates provide 4 kcal per gram, while fats provide 9 kcal per gram. Therefore, 2 kcal per gram is not a recognized caloric value for any macronutrient.

3. **Option 4: 5 kcal** - This option is incorrect because 5 kcal per gram is not the caloric value for any macronutrient. As mentioned earlier, proteins and carbohydrates provide 4 kcal per gram, and fats provide 9 kcal per gram. There is no standard macronutrient that provides 5 kcal per gram.

In conclusion, Option 3 is the correct answer because it accurately reflects the caloric value of protein, which is 4 kcal per gram. This is consistent with established nutritional science and dietary guidelines.