Food means different things to different people. People who are starving see food as a means of survival. People who are proud of their cultural heritage use food to preserve that heritage. People who associate food with happy occasions make eating an important social activity.
Regardless of the meaning food might have for an individual, food is important to all people. Food is important because it is needed to sustain life. The search for food and the means to produce it began centuries ago and will continue as long as life exists.
Basic Food 8th Grade Textbook - Discovering Food and Nutrition
Foods I Textbook - Guide to Good Food
Foods II Textbook - Foundations of Restaurant Management and Culinary Arts