Final answer:
The true statement about obesity is that fat has more calories than protein or carbohydrates, which is key in understanding energy balance and weight maintenance.
Step-by-step explanation:
Considering the information provided and the focus on food and metabolism, the correct statement about obesity among the options given is: c. Fat has more calories than protein or carbohydrates. This is true as fats contain approximately 9 calories per gram, which is more than double the calories in a gram of protein or carbohydrates, both of which have around 4 calories per gram. The concept of calories is significant because it represents the amount of energy food provides, and consuming more calories than the body can use may lead to storing the excess as fat. Ultimately, knowledge about the caloric content of fats, proteins, and carbohydrates helps inform dietary choices that can contribute to maintaining a balanced energy intake and a healthy weight.