15-1 feeding the world
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15-1 Feeding the World. Page 379. A. Humans and Nutrition. 1. Famine is widespread starvation which occurs as a result of a shortage of food. A. Humans and Nutrition. 2. The human body needs food as a source of energy AND a source of building materials for tissues. A. Humans and Nutrition. - PowerPoint PPT PresentationTRANSCRIPT
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15-1 Feeding the World
Page 379
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A. Humans and Nutrition
• 1. Famine is widespread starvation which occurs as a result of a shortage of food.
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A. Humans and Nutrition
• 2. The human body needs food as a source of energy AND a source of building materials for tissues.
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A. Humans and Nutrition
• 3. Malnutrition occurs when people do not consume enough calories or eat a variety of foods to fulfill the body's needs.
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A. Humans and Nutrition
• 4. Malnutrition may affect the physical and mental development of children.
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A. Humans and Nutrition
• 5. A persons diet is the type or amount of food that he or she eats.
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A. Humans and Nutrition
• 6. Diets vary around the world; for example in the U.S. most calories come from meat, fish, and oil.
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B. The Ecology of Food
• 1. As the human population grows, farmlands and cities are replacing forests and grasslands.
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B. The Ecology of Food
• 2. Plants generally have more energy because they are at the base of a food chain.
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B. The Ecology of Food
• 3. Meat, however, provides more nutrients per gram than most plants.
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B. The Ecology of Food
• 4. With limited area to grow food, researchers are trying to increase the efficiency of food production.
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B. The Ecology of Food
• 5. The answer may be in plants or other organisms with a high yield (amount of food produced in a given area).
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C. World Food Problems
• 1. Malnutrition today occurs as a result of poverty and violence.
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C. World Food Problems
• 2. The United Nations Food and Agriculture Organization (UNFAO) estimates that 925 million people around the world are malnourished.
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C. World Food Problems
• 3. The population is growing far more rapidly than grain production (minimal needed for adequate vegetarian diet).
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D. The Green Revolution
• 1. 1950-1970: Mexico increased wheat production and India increased rice production without increasing farmland used.
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D. The Green Revolution
• 2. Limitations included high amounts of water and chemicals for new type of crop.