4/9/12

Post date: Apr 09, 2012 1:16:46 PM

    • Bell ringer (verbal): what parts of the world do you think are most affected by hunger or malnutrition?

    • Continue work on world hunger map

    • Begin 15-1 notes - Feeding the world

      • Key terms

        • Famine - widespread starvation caused by a shortage of food

        • Malnutrition - a condition that occurs when people do not consume enough calories, or do not eat a good enough variety of food to meet the body's needs

        • Diet - the type and amount of food that a person eats

        • Yield - the amount of food that can be produced in a given area

      • Humans and nutritions

        • Use food as energy source and source of materials for building and fixing body tissues

        • Food energy is measured in calories

        • Major nutrients needed: carbohydrates, lipids (oils and fats), proteins (8 essential amino acids)

        • Different problems arise from missing each part of necessary diet, or from getting too much of any part

      • The ecology of food

        • Food efficiency

          • measure of the amount of food produced on an area of land

          • more plant-based food can be produced for humans than animal-based food on an area of land

        • Old and New Food

          • Researchers hope to solve food problems by finding foods that produce more using less water, fertilizer, etc.

          • Examples: glasswort, seaweed

        • World Food Problems

          • World's farmers produce enough food to feed 10 billion people, but food is not distributed evenly

          • Poverty - malnutrition most affects poor subsistence farmers in Africa, Asia, and mountains of South America

        • More income and more food

          • Number of people with malnutrition has decreased by 500 million in last 50 years

          • Need to increase grain production to keep up with population growth

        • The green revolution

          • Between 1950 and 1970, new varieties of plants and new techniques led to rapid increase in food production

          • Most advances only worked for large farms

          • Required people to buy expensive chemicals, equipment

          • Didn't much help poor, isolated farm communities