Calories measure the energy provided by food and drink. The average daily calorie needs vary, but generally:

• For adult men, about 2,500 kcal/day is recommended.
• For adult women, about 2,000 kcal/day is typical.

These amounts can vary based on factors like age, activity level, and weight goals. For weight loss, reducing daily intake by around 600 kcal is often suggested (e.g., about 1,900 kcal for men and 1,400 kcal for women).