Which of the following food types provide energy to the body slowly due to…

CONCEPT: The three energy-yielding macronutrients -- carbohydrates, proteins, and fats -- differ in how quickly the body metabolizes them for energy. Carbohydrates break down fastest into glucose, giving a rapid but short-lived energy release. Proteins are metabolized at a moderate rate and are used mainly for building and repairing body tissue rather than as a routine energy source. Fats undergo the slowest catabolic breakdown (beta-oxidation of fatty acids), so they release energy gradually over an extended period.

APPLICATION: Because fat has the lowest rate of metabolic turnover among the three macronutrients, it supplies energy slowly and steadily -- this is why the body draws on fat reserves during prolonged, low-intensity activity and stores surplus energy as fat for later, slow-release use.

CROSS-CHECK (why the other options do not fit):

• Carbohydrates alone are metabolized rapidly, producing a quick glucose-based energy spike -- the opposite of slow release.

• Proteins alone are broken down at a moderate pace and serve growth/repair functions, not slow sustained energy supply.

• Grouping carbohydrates with proteins is inconsistent, since carbohydrates specifically metabolize quickly, not slowly.

So the food type that provides energy slowly, owing to its slow metabolic activity, is fat.