A staple food, sometimes simply referred to as a staple, is a food that is eaten routinely and in such quantities that it constitutes a dominant portion of a standard diet in a given population, supplying a large fraction of the needs for energy-rich materials and generally a significant proportion of the intake of other nutrients as well. Most people live on a diet based on just a small number of staples.

Bread
The Market Monitor - Trends and impacts of staple food prices in vulnerable countries, Issue 22 - February 2014
The Market Monitor - Trends of staple food prices in vulnerable countries, Issue 19 - April 2013
The Market Monitor - Trends of staple food prices in vulnerable countries, Issue 17 - October 2012
Staple Food
Staple Food
Staple Food
Breeding for micronutrients in staple food crops from a human nutrition perspective
Welch, R. M., Graham, R. D. Breeding for micronutrients in staple food crops from a human nutrition perspective. J. Exp. Bot., 55, 3...
Breeding for micronutrient density in edible portions of staple food crops: conventional approaches.