What is the primary characteristic of negative calorie foods?

The primary characteristic of negative calorie foods is that they require more energy to digest than they provide. This concept is based on the idea that certain foods, particularly those that are low in calories and high in fiber and water content, demand a significant amount of energy for the body to process them. Foods like celery, cucumber, and lettuce are often cited as examples, as they contain very few calories but require more calories to chew, digest, and metabolize than they yield in energy.

This unique property makes negative calorie foods appealing for weight management, as consuming them can potentially lead to a calorie deficit. It's important to note that while they are low in calories, this does not mean they are devoid of nutritional benefits. They can still contribute essential vitamins, minerals, and hydration, making them valuable additions to a balanced diet.

The other choices do not accurately reflect the nature of negative calorie foods. Foods high in sugar do not generally qualify as negative calorie because they provide more energy (calories) than they require for digestion. Processed foods often contain additives and preservatives, which can increase caloric density and do not align with the characteristics of negative calorie foods. Lastly, foods high in fat are energy-dense and typically provide more calories than they consume for digestion