by 
The Curious Bag
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For thousands of years, bread has been a primary staple food in many parts of the world. Bread is popular as a staple food because wheat is easy to grow and abundant, and it provides an excellent nutritional profile.
Carbohydrates
For optimum health, humans should gain nearly half of all calories from carbohydrates rather than fat or protein. High-carbohydrate foods like bread are an excellent source of this critical macronutrient.
Availability
Grains grow abundantly throughout most parts of the world, so they are widely available and inexpensive.
Calories
Bread is higher in calories than most other plant-based foods. Most vegetables offer far fewer calories than grains, so they are insufficient as core components of a healthy diet, especially during times of famine.
Efficiency
Bread requires less land and labor than most other high-calorie foods. For example, meat and dairy products consume a significant amount of land because livestock need pasture or grain.
Significance
Bread's popularity as a staple food affects many aspects of modern culture. For example, the Lord's Prayer includes the phrase "our daily bread," which symbolically refers to food itself.
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