2. Widespread starvation
caused by a shortage of
food.
Shortage of food can be
caused by
Drought
Loss of fertile soil via
improper farming methods
War- lack ability to get to
crops or get crops to market
As our populations grow,
will famine become more
common?
3. Food provides
Energy
building blocks to make
new cells & tissues
Energy in food is
measured in Calories
Must have certain
nutrients to be
considered healthy (see
next slide)
4. Nutrient Building
block
Sources Energy Yield Function
Carbohydrates Sugars Wheat, corn,
rice
4 Cal/g Main source of
energy for
body
Lipids (oils &
fats)
Fatty acids &
fatty alcohols
Olives, nuts,
animal fats
9 Cal/g Makes cell
membranes
for new cells &
hormones
Proteins Amino acids Animal meat,
beans
4 Cal/g Build and
maintain ALL
body
structures
•You must have 8 essential amino acids in your diet. Most people get these
through a variety of foods that they eat.
•When people only eat one type of food (rice or corn) ,because that is all they
have available in their region, then they suffer.
5. Malnourished- someone
does not eat a sufficient
variety of foods to fulfill all
the body’s needs.
Kwashiorker- disease
associated with protein
deficiency.
Discolored skin
Diarrhea
Bulging belly
Muscles deteriorate
Malnourishment can also
lead to reduced mental
development of children
6. Most countries eat more
carbs like grains, rice,
potatoes, bread and less
meat, nuts, proteins
People in the US take in
more calories than other
countries and more of
those calories are from
fats than most other
countries.
Which of these meals is probably found in
a home located in a developed country?
7. An ideal food crop is one that
produces large amounts of
food with little negative
impact on the environment
An area of land used to grow
plants will support more
people than an area of land to
produce meat.
Plants have more stored
energy than animal meat.
If you raise cows you have to
also raise grain to feed them.
The energy in the grain fed to
the cow decreases before it
gets to humans.
8. There is enough food on the
planet.
The food is not divided equally.
People who live in poverty are
more likely to be malnourished
Most farmers in rural developing
countries are subsistence farmers-
farmers who grow only enough
food for local use.
Small plots
Grow enough to feed family &
make small profit.
Make less than $1 a day-
considered poverty level
Helping rural subsistence farmers
grow & maintain crops will help
fight poverty & malnourishment
in developed countries
9. New varieties of grain were
produced
If given enough water,
fertilizer, pesticide, these
crops were very productive.
Problems with Green
Revolution:
Made large agricultural
businesses better able to
produce food
Poor subsistence farmers
could not afford the fertilizer
& pesticides needed to get
high yields from new crops
10. Scientists are trying to create
plants that can grow…
In sandy or salty soil
Without much water
Without the need for chemicals
In crowded conditions
With added nutrients or
vitamins
Examples:
Triticale- can grow in sandy, dry
soil. Might grow in salty soil.
Golden rice- rice grown with
vitamin A added to it through
genetic engineering. Vitamin A
helps prevent blindness
11. Identify the major cause of malnutrition.
Compare the environmental costs of producing
different types of food.
Explain how malnutrition today is linked to poverty.
Describe the importance and effects of the green
revolution.
