GLOBAL DISPARITIES IN NUTRITION AND HEALTH
CHAPTER INTRODUCTION
Humans must have food to survive. Hunting
and gathering provided a precarious existence, but with
the development
of agriculture, surpluses of food could be produced. Concerns about food
supplies and population appear periodically but predicted global shortages
have not materialized. Yet there is hunger, even in an affluent country like the
Just twenty years ago, predictions of regional famines
in countries with large populations and high growth rates regularly made
headlines, and the warnings seemed to have a Sound basis: population growth was
outpacing the Earths capacity to provide enough food, let alone distribute it
where it was most needed. Today, daily caloric consumption still varies from
high levels in the richer countries such as the
The
Green Revolution
The ‘miracle that was seen as the only solution for
a hungry world, with rapidly increasing population numbers, in the 1970s came in
the form of miracle rice and other high-yielding grains developed by technicians
working in agricultural research stations. Crop yields rose dramatically,
especially in
The “miracle” of increased food production was the
result of the so-called Green Revolution (the introduction of new, more
productive strains of grains and the resulting harvest increases), also called
the Third Agricultural Revolution. Actually underway since at least the l950s,
the biogenetic advances in the l970s appeared to have permanently solved the
world’s food shortages. But this may no longer be true.
Some researchers believe that the Green Revolution has
run its course. Lack of commercial fertilizers, water for irrigation, and
additional farm land may revive the threat of widespread malnutrition or worse.
In addition, the Green Revolution primarily increased the yields of wheat, rice,
and some other cereals but not all
grains
or food production. It also had far greater affect in
Distribution
of Dietary
Patterns
The map of average daily calorie consumption is based
on data that are not always reliable, so it gives only a general impression of
the global situation. Statistical information about caloric intake, especially
for countries in the periphery, is often based on rough estimates rather than on
accurate counts. Nevertheless, the map reveals rather clearly the world
distribution of hunger and malnutrition—conditions of ill health resulting
from the deficiency or improper balance of essential foodstuffs in the diet. It
is apparent that malnutrition still afflicts and shortens the lives of
hundreds of millions of people, especially children, who are often the first
victims in villages when food supplies dwindle. Pockets of malnutrition occur
even within many of the better-nourished countries where pockets of poverty
still exist.
A Future Global Food Emergency?
Although global food production is sufficient to feed
the worlds people (if it were evenly distributed), concerns are rising that a
food emergency may develop. Among the factors and circumstances that may
contribute to future food emergencies, the most serious are population growth,
climatic change, and rising energy costs.
Population growth is a major factor in any
consideration of future food supplies, particularly in
Climatic change is also a risk factor. If some
predictions are true, the primary environmental problem of the first quarter
of the twenty-first century may be wide fluctuations in weather conditions producing
extremes capable of destroying crops and farmland. If this were to be the case,
sustaining food production, let alone increasing it, may be difficult
There is a good chance that the cost of energy may
rise again, as it did during the 1970s. If it does so will the cost of
fertilizers and fuel for equipment. For farmers in many countries, this would be
disastrous.
A
More Secure Future
The mitigation of a future food crisis depends on
policies and practices ranging from family planning and women’s rights to
improvement of distribution systems and expansion of farm lands. These and other
issues would require cooperation on a global scale that may be difficult, if
not impossible, to achieve. Yet the food crisis of the 1970s was a harbinger of
the future. In time, a rising tide of world hunger may again threaten world
order. All humanity has a stake in the war on malnutrition.
Spatial
Patterns of Health and Disease
Americans
take good health for granted. It may be expensive, but the capacity for good
health is present in our society, as it is in all developed
countries. For much of the world’s population, especially those residing in
tropical areas and other poorer countries, the situation is quite
different.
Good health, like adequate food is unevenly distributed.
Patterns of health show even greater regional differences than those for the
distribution of food. When people are inadequately fed they are susceptible to
many debilitating diseases. Similarly, women who are healthy tend to
bear healthy babies, but women
who suffer from malnutrition and related maladies are less fortunate.
In many poorer countries people, especially children, are visibly malnourished The
resulting
disadvantages will be with them for life--if they survive childhood.
The study of health in
geographic context is called medical
geography. Many
diseases have their origin in the environment They have source (core) areas,
spread (diffuse) through populations along identifiable routes, and affect
clusters of population (regions) when at their widest distribution. Mapping
disease patterns can provide insights into relationships between diseases and
environment and sometimes give clues to source regions.
Malnutrition
and Child Mortality
It is difficult to identify the specific effects of
malnutrition on peoples susceptibility to disease, because so many other factors
are present. However, there is little doubt about the effects of malnutrition on
growth and development. The impact on children is especially important, who are
often the first to be affected when food supplies become inadequate.
Infant and child mortality
reflect the overall health of a society. Infant mortality is
recorded as a baby’s death during the first year following its birth; child
mortality records
death between ages 1 and 5. The
map showing the world distribution of infant mortality reveals the high rates in
many poorer countries. The map also clearly shows the relationship between
social disorder and high IMRs. Conflict, dislocation, and refugee movements
produce high IMRs, and the map reflects this.
Even if there is general
adequacy of available calories, protein deficiencies still
have a devastating affect on children, as they do for entire populations. In
tropical areas especially, dietary deficiencies inhibit the development of young
bodies and the resultant problems follow children through their entire lives.
Life Expectancy
Figure
30-3 maps average
life
expectancies as of the late 1990g. The map is important in understanding the
world population because life expectancy is another key measure of the
well-being of a population. Life expectancies have increased significantly
over
the past half-century, as the map suggests and it does underscore the aging
of
many populations, but the map does not show a number of
other
important
aspects
about
a
population.
For example women have far
greater life expectancies than men virtually everywhere. In the late 1990s, the
world average life expectancy was 68 for women and 64 for men, and the map
reveals huge
regional contrasts Most African countries fell well short of
these averages. The figures represented on the map are actually averages that
take into account the
children who die young and the people who survive well beyond
the average. Thus the dramatically lower figures for the world’s poorer
countries primarily reflect high infant
mortality. These figures should change as improvements in medical facilities,
hygiene, and drug availability suppress death rates.
Types
and Patterns of Disease
The incidence and types of diseases that affect a
population, like life expectancy, also reveal the conditions in which people
live. Certain kinds of environments harbor dangerous disease carriers, and
diseases have ways of spreading from one population to another. Medical
geographers are interested in both the regional distribution of diseases and the
processes and paths whereby diseases spread of disease.
Tropical areas, wherein are located many
of the worlds people (see text Figures 3-7 and 4-I), are zones of intense
biological activity and hence are the sources of many disease-transmitting
viruses and parasites. Certain major diseases remain contained within tropical
or near-tropical latitudes (much of this is due to
limited environment tolerance by these diseases), but others have spread into
all parts of the world. Before European exploration and colonization, many
diseases were limited to region outbreaks (called epidemics) and only
took on global significance when they were carried to all parts of the globe
(termed pandemics). As transportation improved and human movement on a
global scale increased, so did the spread of many diseases. AIDS, for example,
originated in tropical
In the rapidly expanding urban areas of
periphery countries today, densely populated shantytowns with inadequate
sanitation and contaminated water supplies are highly susceptible to outbreaks
of disease. In December 1990; a cholera outbreak began in the slums of
Dramatic as are the global pandemics of
AIDS, influenza, or cholera, the number of cases of heart disease, cancer,
stroke, and lung ailments are far greater. These chronic diseases (also
known as degenerative diseases and generally associated with old age) have
always been the leading causes of death and remain so today in the
CHAPTER
QUIZ
MULTIPLE
CHOICE QUESTIONS
1.
Today marine food webs are being disrupted by:
a.
changing ocean currents
b.
rising water temperatures
c.
pollution
d.
overfishing
2.
Which of the following is not
one of the factors that determine people’s diets.
a.
personal preference
b.
economic circumstances
c.
traditions
d.
what the
soil
and climate
can produce
3.
The food
chain is
a sequence
of consumption that
starts with:
a.
herbivores
b.
humans
c.
green plants
d.
carnivores
4.
Which of the following is most vital to a child in the first three years
of life.
a.
carbohydrates
b.
proteins
c.
fats
d.
minerals
5.
It takes ?
times as much soil, water, and fertilizer to sustain a person in the
a.
5
b.
10
c.
15
d.
20
6.
Which of the following is not one of the leading causes of death in the
Western world.
a.
AIDS
b.
cancer
c.
heart diseases
d.
strokes
7.
The continent with the highest infant mortality rate is:
a.
b.
c.
d.
8. In the late 1990s, which region had one-fifth of
its population age 60 and over.
a.
North
America
b.
c.
d.
9.
Chronic diseases are the diseases of:
a.
longevity
b.
youth
c.
males
only
d.
males only
10. Influenza
originally came from:
a.
b.
c.
d.
TRUE/FALSE
QUESTIONS
1.
One of the main reasons people do not have adequate food in poorer
countries is the lack of good transportation (TF)
2.
In poorer countries, even if enough food is available malnutrition is common. (TF)
3.
4.
Fish harvests from oceans are growing and feed people in poorer countries
with access to them. (TF)
5.
Cash-crop plantations in former colonial
countries continue to make money that allows people to buy needed food. (TF)
6.
Poor sanitation is the key factor in high infant mortality rates. (TF)
7.
Average life expectancy may vary from rich to poor countries, but in all
cases women outlive men. (TF)
8.
Malaria, yellow fever, sleeping sickness, and bilbarzia are vectored
diseases caused by mosquitos, or flies. (TF)
9.
Influenza is a virus transmitted from birds, to pigs, to humans and
originates in
10.
Chronic diseases tend to be associated with an older aging population
found mostly in the richer developed countries. (TF)
STUDY QUESTIONS
1.
What
constitutes a balanced diet? Why are some people suffering from malnutrition
when their diet is over 2000
calories a day? How does a dietary deficiency affect children?
2.
Looking
at Figure 30-1, which continent has the worst fed countries? List the problems
encountered by these countries that contribute to their food shortages.
3.
A)
What areas of the world have improved their caloric intake and why?
Discuss the regional variations found within many countries. List the conditions
that cause such regional variations. B)
What are the three major types of disease? Discuss the major vectored diseases:
what is the vector, how do they spread, are they worldwide, how do they affect
people? Use your text to help you find the core area of these different
diseases.
4.
List and explain the possible causes for a
future global food emergency.
5.
List and discuss ten areas that need to be addressed in possibly
preventing another world food crisis.
6.
How are infant and child mortality defined in the text? What are the
causes of kwashiorkor and marasmus?
7.
What are the main factors that contribute to infant mortality? Which
countries are shown in the highest category of infant mortality? Discuss infant
mortality in the different world regions and variations within each region.
8.
How are nonvectored infectious diseases spread? Which of these has
reached the pandemic stage many times? Explain how the cause of this disease was
discovered. Discuss the spread of AIDS. Where are infection rates the highest?
9.
Briefly discuss chronic and genetic
diseases. In what sector of the population are most chronic diseases found? What
causes genetic diseases?