Part 3/9:

In scientific terms, calories relate to the metric and SI (International System of Units) systems. Notably, one calorie equals approximately 4.184 joules, the SI unit of energy, leading to one kilocalorie equating to approximately 4,184 joules. The body stores excess energy primarily as lipids (fats) for future utilization and glycogen for immediate energy needs.

Nutritional Molecules: Macronutrients and Micronutrients

Food molecules serve as vital building blocks for growth and development. Nutritional molecules are categorized into two groups: macronutrients and micronutrients. Macronutrients include carbohydrates, fats, and proteins, while vitamins and minerals constitute the micronutrient category.