介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[12:04.16]The last reading.
[12:06.90]Food Staple
[12:09.03]A food staple is a food that makes up the dominant part of a population's diet.
[12:15.89]Food staples are eaten regularly
[12:18.68]and supply a major proportion of a person's energy and nutritional n...

介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[12:04.16]The last reading.
[12:06.90]Food Staple
[12:09.03]A food staple is a food that makes up the dominant part of a population's diet.
[12:15.89]Food staples are eaten regularly
[12:18.68]and supply a major proportion of a person's energy and nutritional needs.
[12:24.78]Food staples vary in different places,
[12:27.88]depending on the food sources available.
[12:31.33]Most food staples are inexpensive, plant-based foods that are full of calories for energy.
[12:37.88]There're more than 50,000 edible plants in the world,
[12:41.79]but just 15 of them provide 90 percent of food energy amount that the world's population take in.
[12:49.11]Food staples traditionally depend on what plants are native to a region.
[12:54.49]However, with improvements in agriculture, food storage, and transportation,
[12:59.93]some food staples are changing.
[13:02.42]Foods that were particular to one region are becoming popular in regions
[13:07.24]where they don't traditionally grow.
[13:09.84]Although staple foods are nutritious,
[13:12.53]they do not provide the full, healthy range of nutritious substances.
[13:17.56]People must add other foods to their diets to avoid malnutrition.