Why are carbohydrates, proteins and fats all necessary in a balanced diet?

Correct answer: All three have different roles in energy, body building and body functions

Carbohydrates are a major source of energy, proteins supply amino acids for growth and tissue repair, and fats provide concentrated energy, essential fatty acids, insulation, and help in absorbing fat-soluble vitamins. Their roles overlap in supporting health but are not identical. A balanced diet includes suitable amounts of all three rather than treating them as substances that only add taste or water.