if food is not hygienic we may fall pray to any disease. food is something which provides us with energy and helps in is somethingwhich keeps us healthy in a way by providing nutrients and vitamins. it directly affects our body when food is not clean. dehydration ,vomitting, stomach pain etc may be the results of  the consuming of food prepared in unhygeinic conditions.even though the hcl acid inside the stomach can kill much of the germs in food , some may remain causing diseases.thus we must never consume unwashed vegetables etc. When ppl consume junk food they do not feel full and consume a lot more to feel full. This results in more consumption of carbon leading to many diseases.actually this food doesn't giv any nutrients.
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i hav edited it as per ur suggestion sir.

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Out regular food at home is the nice and acceptable food, from the point of view of taste or hygiene.  People are expected to eat that food regularly.   However often people may be forced to eat junk food, or they may intentionally go for it.

Junk foods are the fast foods, road side foods, food sold on platforms, ready made food sold on very small push carts, oily chips, fryums, pakode (pakodi) etc.  Any ready made food that is not prepared at home and is made on commercial basis may be termed as junk food by the parents or doctors.  Usually junk food is attractive, perhaps cheaper and is readily available.

Junk food may not be prepared with hygienic methods.  It may use oils and flours which are perhaps not very clean and good quality.  A lot of chilli powder, spices may be mixed in these foods.  Some additives or preservatives may be added to the food for colour or flavour.

Junk food helps temporarily but could have other side effects.

1.  Health may be spoilt because the food may contain some items which are not suitable for ones health.  Like some persons may suffer from constipation and certain flours or grams are not good for them.

2.  When people eat junk foods, they eat too much.  Or, they eat again the regular meals. So over eating also causes problems.

3. Many people may have some allergies to certain additives in the junk food.  Perhaps the food is not made in clean utensils.

4. Junk food may not be a balanced diet.  It certainly creates imbalance in the body in minerals and vitamins.

5.  Junk food may cause acidity or gastric problem or loose motions or constipation, if taken in large quantities.

6.  There may be dust or other particles in the food open to air. That will spoil the stomach and cause infection.

7.  Junk food stored for some days may be degraded or oxidized.

8. People may eat junk food without cleaning their hands. Or the food may be kept open to polluted air.  So bacteria or germs may cause harm.

9.  Eating junk food becomes an addiction. So people or children may not be able to avoid it in future.

10. There may not be a proper health or quality control done on junk food.

11. Junk food may be too hot or too cold, it may cause throat infection.  Too many sweets or chocolates etc. cause problems in teeth.

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