4 kilo calories of energy is released by _______

The correct answer is one gram of protein.

Key Points

• One gram of protein releases 4 kilo calories of energy when metabolized.
• This is because proteins are made up of amino acids, which can be broken down and used by the body for energy.
• One grams of fat also release 9-kilo calories of energy, as fats are a concentrated source of energy.
• One gram of sugar releases only 3.87 kilo calories of energy, as it is a simpler carbohydrate that is quickly metabolized by the body.
• 3 grams of protein would release 12-kilo calories of energy, which is three  times the amount stated in the question.

Additional Information

•  Proteins are essential macronutrients that are important for building and repairing tissues in the body.
• They are made up of amino acids, which are linked together by peptide bonds.
• Fats are also important macronutrients that provide energy, support cell growth, and protect organs.
• They are composed of fatty acids and glycerol.
• Sugars, or carbohydrates, are another important source of energy for the body.
• They are broken down into glucose, which is used by the cells for energy.
• Four grams of fat is equivalent to about one teaspoon of oil or butter.