What's balanced diet all about

Diet that contains all the components in the optimum proportions and quantity required for maintaining the body in perfect state of health,activity and development.

  The amount of each substance required depends on age , sex , occupations etc

**Carbohydrates
- are the main energy producers or fuel
  substances in our body.
- 1.0 g gives 4kcal energy.
- Excess of carbs in food is changed
into fat , through the process of  
lipogenesis.
- Cereals,sugarcane,milk, etc are some
Sources of carbs

**Lipids
- are stored source of energy.
- to provide the resistive layer in
human bodies , fats are stored behind
the skin.
- they are of two types
     Simple (eg. Fat and oil)
     Compound (eg. Lecithin , glycolipid)
- oxidation of 1g fat yields 9.3 k cal
energy.
- stored fat is used as fuel when
glucose is not available.
- lipase enzyme digest fat and break it
into fatty acids and glycerol.

2 types of fatty acid are:
1) Saturated
2) Unsaturated

Excess of saturated fats in diet may lead to heart attack as they increase blood cholesterol .

**Proteins
- role is to grow , develop and repair
the body.
- they are polymers of amino acids.
2 types of Amino acids are :
1) essential can not synthesized in the
  body and must be taken from outside .
  (Eg.lysine,methionine,valine,tryptophan
etc)
2) non - essential synthesized in the
  body and do not need to be taken from
  outside.
( eg. alanine,arginine, glutamine,proline etc.)
- main sources are soybean , milk ,
   lentils , etc
  

We need to take Minerals and Vitamins too for the development of tissue formation , controlling metabolism ,body functioning etc.