You didn't really provide us with any choices here - but judging by the topic, to determine nutritional status of a food we usually measure the amount of protein, carbohydrates (and sugars), fats (and saturated with trans as well), fiber, and the different micronutrients such as vitamins and minerals.
John Locke was the philosopher who maintained that knowledge comes from experience via the senses, and therefore, science should rely on obersvations and experiments.
