The food industry is a complex, global collective of diverse businesses that supplies most of the food consumed by the world's population. Only subsistence farmers, those who survive on what they grow, and hunter-gatherers can be considered outside the scope of the modern food industry.
The food Industry includes:

Agriculture: raising crops, livestock, and seafood
Manufacturing: agrichemicals, agricultural construction, farm machinery and supplies, seed, etc.
Food processing: preparation of fresh products for market, and manufacture of prepared food products
Marketing: promotion of generic products (e.g., milk board), new products, advertising, marketing campaigns, packaging, public relations, etc.
Wholesale and food distribution: logistics, transportation, warehousing
Foodservice (which includes catering)
Grocery, farmers' markets, public markets and other retailing
Regulation: local, regional, national, and international rules and regulations for food production and sale, including food quality, food security, food safety, marketing/advertising, and industry lobbying activities
Education: academic, consultancy, vocational
Research and development: food technology
Financial services: credit, insurance