Define energy balance and explain how it informs weight-management strategies.

• A. Energy balance is the relationship between energy intake and energy expenditure; deficits lead to weight loss, surpluses to weight gain, and adjustments guide interventions.
• B. Energy balance is a measure of hydration status.
• C. Energy balance describes the balance between protein and carbohydrate intake.
• D. Energy balance is determined by resting metabolic rate alone.

Answer: (A)