When talking with Mr.Mario,the nurse is asked to explain what she means by "energy balance." Which is the best response by the nurse?

A) Eating 15% more calories than our body uses for energy
B) Eating 15% fewer calories than our body uses for energy
C) Maintaining a balance between the blood glucose level and the insulin level
D) Maintaining extra insulin in the blood for utilization when needed

Energy balance refers to the equilibrium between the energy (calories) consumed through food and drink and the energy expended through various bodily processes and physical activity. Option C, which talks about maintaining a balance between blood glucose level and insulin level, closely relates to the concept of energy balance in the context of metabolic processes, even though it doesn't directly address the calorie intake vs. expenditure aspect. However, given the options provided, it's the one that most closely aligns with the principles of energy balance, as insulin plays a crucial role in the metabolism of glucose, which is a primary energy source for the body. Options A and B are incorrect because they suggest an imbalance by proposing eating more or fewer calories than the body uses, which does not define energy balance. Option D is incorrect because it focuses on maintaining extra insulin, which does not directly relate to the concept of energy balance.