Chapter 1 overview of nutrition

Chapter 1
An Overview of Nutrition


How do we choose foods?


How do we choose foods?
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Personal Preference
Habit
Tradition and heritage
Social Interaction
Availability, Convenience and
Economy


How do we choose foods?
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Positive or negative Associations
Emotional
Values

Body Weight and Image

• FINALLY: Health Benefits....


What is Nutrition?


Nutrition
• The study of the nutrients and their
digestion, absorption, transport,
metabolism, interaction, storage, and
excretion.


Nutrition
• Everything that happens to a nutrient
from the time one ingests food until
the waste products and/or
metabolites are excreted.


Nutrients
• Substances from foods that the body
use to:
– promote growth
– regulate body processes
– provide energy
– repair tissues

What is in our body?


Body Composition

About 60 % water


Which are the Nutrients?


How can we classify the
Nutrients?


Organic

CHO
Lipids
Proteins
Vitamins

Nutrients
Inorganic

Water
Minerals

Nutrients
• Organic

• Inorganic

contain CARBON

do not contain Carbon



Another Classification


Energy Yielding

Nutrients

CHO
Lipids
Proteins

Non Energy Yielding
Water
Vitamins
Minerals



And Another Classification

Macronutrients

Nutrients

CHO
Lipids
Proteins
Water

Micronutrients
Vitamins
Minerals


What happens if we don’t use
that energy?
• Excess of energy is store in the body


Energy
• Energy is measured in Kcalories
• IU: kjoules.


How do we know how much
calories we consume?
• gram of CHO

x 4 kcal

• gram of protein x 4 kcal
• gram of fat

x 9 kcal


Energy from Foods


How do we know if a person is
consuming enough of the
different nutrients?