Calories indicate and measure the energy available in food. Fat is the
most calorie-dense food and carbohydrates are the body's preferred
energy source. Protein and carbs each contain 4
calories per gram and fat contains 9 calories per gram.
When parasites are found in food, the food has been exposed to undercooked fish, crabs, and mollusks. undercooked meat; raw aquatic plants such as watercress. raw vegetables that have been contaminated by human or animal feces
