1. Introduction to Nutrition
Composition of the Body
You are a collection of moving parts
Parts are continually changing and are
continually using NUTRIENTS.
2. Introduction to Nutrition
Oldest red blood cell – 120 days
Lining of digestive tract – renewed every
Fat beneath your skin – not the same
that was there a year ago
Skin – always being replaced.
3. Introduction to Nutrition
All the pieces you are made of come
from the nutrients you have eaten.
The science of nutrition is the study of
how this takes place – The study of
nutrients in food and the body’s handling
of these nutrients.
4. Terms used in Nutrition
Food – Any substance, solid or liquid
which when swallowed performs one or
more of these functions:
To promote growth
To produce heat and energy
To regulate the health of the body,
maintain normal body processes and
5. Terms used in Nutrition
Nutrients –Chemical substances
found in food.
The essential nutrients are those the
body cannot make for itself in
sufficient quantity to meet
physiological needs, and which must
therefore be obtained from food.
The processes by which nutrients are broken
down to yield energy or rearranged into body
Anabolism – reactions in which small molecules
are put together to build larger ones.
Catabolism – reactions in which large molecules
are broken down into smaller ones. Catabolic
reactions usually release energy and often
8. Basal Metabolic Rate
The rate at which the body uses
energy for maintaining minimal
bodily functions, such as body
temperature, respiration, and heart
beat when at rest.
A unit by which energy is measured.
Definition – The amount of heat required
to raise the temperature of 1 gram of
water to 1 degree Celsius.
Food we eat each day
Balanced diet – A diet that supplies all
the essential nutrients in the correct
proportions for the needs of the
13. Recommended Dietary Allowances
The levels of nutrients recommended as
desirable goals in nutrition for all normal,
Minimum Daily Requirement (MDR) –
The amount of a vitamin or mineral
needed to prevent symptoms of a
deficiency and to provide a small margin
Implies long-term dietary imbalance. An
imbalance of nutrient intakes.
Obesity – over consumption of energy or
Under nutrition – under consumption of
energy or nutrients..