Overview

Food is any substance consumed by people and animals to sustain life and support biological functions. Living organisms take in food to obtain energy and essential nutrition. Typical sources are plants and animals; in human society these are obtained in many ways, including direct production and market purchase. The act of eating is both a biological necessity and a social activity: humans and other animals eat to survive and often share food for cultural reasons.

Components and nutrients

Food delivers a mixture of chemical components that the body uses for fuel, structure and regulation. Major categories include:

  • Proteins — build and repair tissues and serve as enzymes.
  • Fats — concentrated energy stores and components of cell membranes.
  • Carbohydrates — the body’s preferred quick energy source.
  • Vitamins — organic compounds needed in small amounts for metabolic processes.
  • Water — a critical component for nearly all physiological functions.
  • Minerals — inorganic elements like calcium and iron required for bones, blood and enzymes.

Beverages that supply energy or nutrients are commonly called drinks. In many diets the balance among these components influences health, body composition and chronic disease risk.

Production and processing

Most human food originates from agriculture, whether through farming on a commercial scale or smaller-scale gardening. Animal-derived foods include meat and dairy, while plant-derived foods include grains, fruits and vegetables. Raw commodities are often transformed by the food processing industry: cleaning, milling, fermenting, cooking and packaging alter texture, flavour and shelf life. Processing can add or remove ingredients; many processed items contain food additives such as preservatives to slow spoilage. A simple example of a processed staple is bread.

Culinary use, culture and distribution

Food preparation happens at home in the kitchen by a cook, often following a recipe from a cookbook. Common utensils include plates, knives, forks, chopsticks, spoons, bowls and multifunction tools like a spork. Typical cookware examples are pressure cookers, pots and frying pans. Many people obtain meals from restaurants, street vendors or communal cafeterias such as those in schools. Others purchase ingredients from shops and markets or choose to buy prepared foods for convenience.

Diets, ethics and notable distinctions

Food choices are shaped by culture, religion, personal preference and health. Some people avoid certain animal products: for example, refusing meat is a common practice, and dairy such as milk is excluded by others. Omitting meat while still eating other animal products is often called vegetarianism; excluding all animal-derived ingredients is termed veganism. Food may be classified by origin (plant vs. animal), method of preparation (raw, cooked, fermented) or degree of processing.

Safety, preservation and modern concerns

Ensuring that food is safe to eat involves handling, storage and cooking practices that reduce contamination and spoilage. Preservation methods range from refrigeration to chemical additives and traditional techniques such as drying, salting and fermenting. Economic and environmental questions—including who has access to sufficient food—affect policy and public health. Where food is scarce, people may experience hunger; where it is abundant but processed, health issues like obesity and nutrient deficiency can arise. Understanding the sources, composition and cultural roles of food helps individuals and communities make informed choices about what they consume and why.

Food touches many aspects of daily life: nourishment, identity, economy and environment. For further reading on specific topics such as nutrition science, agricultural methods and culinary traditions, consult specialized resources and guides. For example, explore introductory materials on food systems, additives and preservation, and practical cooking techniques discussed above.