grade 7

1. LESSON 1 -
NUTRITION

2. Why do we eat?

3. WHY DO WE
EAT?
• Weeat foodbecause we
are hungry.

4. WHY DO WE
EAT?
• Weneed energyfor
activity, growth, andall
functions of the bodysuch
as breathing, digesting
foodandkeeping warm.

5. WHY DO WE
EAT?
• Weneed nutrients for
the growthand repair
of the body,and for
keeping the immune
system healthy.

6. ENERGY
• Energyis defined as the capacity to do work.
Through the process of digestion, we convert
the food we eat to energy
. This food energy is
calculated as Calories(Cal).
• Calorieis the amount ofheat energyneeded
to raise the temperature of 1 Kg (1 Liter) of
water by1°C.
FOOD ENERGY CALORIE

7. NUTRIENTS
• Food is made of nutrients.
• Nutrientsare compoundsin foods essential
to life and health, providingus with energy,
the building blocks for repair andgrowth,
andsubstances necessary to regulate
chemical processes.

8. 6 GROUP OF NUTRIENTS
1. Proteins
2.
Carbohydrates
3. Fats
4. Vitamins 5. Minerals 6. Water

9. Proteins
• Aproteinis a large molecule that is madeof amino
acids andcontains carbon, hydrogen,oxygen,nitrogen,
andsometimes, sulfur.
• Proteins have manyfunctions suchas:
- relayingsignals between cells
- protecting against disease
- providingsupport to cells
- speedingupchemical reactions
• Aminoacids aremolecules that combineto form
proteins.

10. Sources of
Proteins

11. Carbohydrates
• Carbohydrates aremolecules madeof
carbon, hydrogen, andoxygen atoms,
andareusually the body’s majorsource
ofenergy.
• Carbohydrates arecommonly in one of
three forms – starches, sugars, or
fibers.

12. Good Source
of
Carbohydrates

13. Fats
• Fats are also called lipids.
• Fats orlipids provideenergyand help
your bodyabsorbvitamins.
• Fats or lipids are a majorpart of cell
membranes.
• Body fats help to insulate against cold
temperatures.

14. Good
Sources of
Fat

15. Vitamins
• Vitamins are nutrients that
are needed in small
amounts.
• Vitamins are needed for
growth, regulation of body
functions, and prevention of
some diseases.

16. 2 Types of
Vitamins

19. Minerals
•
•

21. Water
• Water(chemical formula H2O)is aninorganic,
transparent, tasteless, odorless,andnearly colorless,
chemical substance.
• Upto 60%of the humanadult bodyis water
.
• Ourbodytakes in water whenwe eat or drink.
• Welosewater whenwe sweat, urinate,speak, breathe.
• Whenwater is not replaced, youmight become
dehydrated.
• Symptomsof dehydration include thirst, headache,
weakness, dizziness,andlittle or nourination.

22. A BALANCED
DIET
• Abalanceddiet includes
carbohydrates, proteins, fats,
vitamins, minerals, and water.
• Abalanceddiet contains
differingkinds of foods in certain
quantities andproportions.

24. FOOD LABELS
• Foodlabels helpyou
determine the amount
of protein,
carbohydrates, fats,
and other substances
in food.
• Afoodlabellists a
food’s nutrients per
serving, not per
container.