Different definitions, different references, etc.

Food refers to substances that can meet the body's normal physiological and biochemical energy needs and extend normal life, while food materials refer to the raw materials needed to make food.

Food refers to raw materials, such as vegetarian food, meat food, cold food, hot food, etc. Food refers to carbohydrates, fats, proteins, and water, which can be eaten or Drinking a substance that provides nourishment or pleasure to humans or living things.