2. FOOD - DEFINITION
Food refers to any substance that nourishes our
body or in other words, it is anything that we can
digest, absorb and utilize, for various
physiological functions of the body including
growth and development.
3. Food groups
Food groups can also be classified according to their functions
Group 1. Energy giving foods- This category includes foods rich in carbohydrate
and fat
Cereals , roots and tubers
Sugar and jaggery
Fats and oils
Group 2. Body building group – this category includes foods rich in protein
Milk and milk products
Meat and meat products, fish, egg or poultry
Pulses
Nuts and oilseeds
Group 3. Protective or regulatory foods – This group include foods providing
vitamins and minerals
Fruits
Vegetables
4. NUTRITION DEFINITION
Nutrition is the science of food and a study of the process
that includes everything that happens to food from the
time it is eaten until it is used for various functions in the
body.
It is the scientific study of foods and the nutrients therein;
their action and interaction and balance, in health and
diseases.
It is the study of ingestion, digestion, absorption,
utilization and assimilation of nutrients present in food.
5. Essential Components of Food
Carbohydrates
Proteins
Fats
Minerals
Vitamins
Roughage (Fibre)
Water
Nutrients are those chemical substances in
foods that are required by the body for energy,
growth and maintenance.
6. Nutrients can be broadly classified as
macro- and micro-nutrients depending
upon their daily requirements by the
body.
Macro and Micro Nutrients
7. Macro and Micro Nutrients
Some nutrients are needed in larger amounts,
these are called macronutrients. Nutrients like
Carbohydrates, proteins and fats and water
are macronutrients.
vitamins and minerals are required in small
amounts and are called micronutrients.
8. Macro Nutrients
Macronutrients are required by the body in relatively
large amounts. Carbohydrates, proteins and fats are
macronutrients and are also called ‘proximate
principles’ because they form the main bulk of the diet.
carbohydrates: 55-60%; protein: 10- 15% and fats: 20-
30%.
Water does not provide energy but is a vital nutrient
required in large quantity for functioning of metabolic
processes in the body and various regulatory functions.
Therefore, it is also considered a macronutrient.
9. Micro Nutrients- Minerals
minerals required in larger amounts called
macro-minerals
Sodium
Chloride
Potassium
Calcium
Phosphorus
Magnesium
Sulphur
Minerals - inorganic elements
those required in smaller amounts are called
micro-minerals (trace minerals).
Iron
Zinc
Iodine
Selenium
Copper
Fluoride
Chromium
Molybdenum
10. Micro Nutrients - Vitamins
Water Soluble Vitamins
B complex
Vitamin C
All Vitamins are
Organic
Fat Soluble Vitamins
Vitamin A
Vitamin D
Vitamin E
Vitamin K