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If our food is not clean then the most problem is first caused in our stomach or digestive system. Food needs to be hygienic if it isn't then all the germs which are present in the dirty food gets in our stomach which can be dangerous for anybody.Sometimes in hotels the kitchen is not clean or hygienic .When there is food left after the day is over they (hotels) do not make the fresh food the next day.Instead they give us the same leftover food which was prepaid the previous day.This causes us to eat stale food. Eating stale food can cause a lot of infections and our digestive system may be damaged. If we continue to eat unclean food then there would be some kind of disease and we will fall sick, extremely sick and we can even die. Mostly food is unclean because of bacteria which is present on it. We must eat clean food. Some foods are eaten raw. Some foods are cooked before being eaten.. Most fruits like mango, papaya, grapes and apple are eaten raw. Some vegetables like carrot, radish and cucumber are also eaten raw. We must wash fruits and vegetables thouroughly before eating them. Before cookoing all vegetables, pulses and grains should be washed thouroughly. Cooking will further kill the germs. However, overcooking can kill the nutrients. We should preserve our food if we want it to be clea. Some methods of preservation is jamming/jellying pickling, drying, canning, refrigeration, tetra packing.
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If our food is not clean, then we could face a lot of health problems later on.  Often We may not face any immediate illness after eating unclean food, but still it could harm over a long time.  So, it is not at all advisable to eat any food that is not clean.  Some times what is called as food poisoning can happen.

Unclean food can mean food prepared using insufficiently cleaned liquids, water, grains, flour or vegetables.  Food becomes unclean even if one prepares or cooks unclean utensils.  Even after preparation, if we do not keep lids on the utensils properly, or store them properly the food may become spoilt. It is also important to preserve food carefully in refrigerator.  Further, it is also important to eat hot food and not when it is cold.

When we eat unclean food, it contains germs, bacteria, worms, and insects.  Also the food could be fermented or oxidized.  These cause some stomach related troubles like constipation, indigestion, and gastric troubles. Further, some infections in stomach or intestines could develop.  Generally, when children drink unclean water in villages or towns, they get dysentery.  Many persons show signs of vomiting the food out.  Our body defence mechanism cannot recover easily from the damages if we eat unclean food regularly.

Certain small effects of unclean food, can show up in the form of allergies.  Infections inside the body can spread and may cause incurable diseases.  If viral infections are contracted through water or food, then it can become severe too.  Use of antibiotics to cure such viral infections makes a person very weak.

Unclean food or water may contain dust. That may get collected in kidneys and develop as stones.  This results in a lot of pain and will need treatment over a long duration.

It is advisable to eat hot and cleanly prepared food from quality sources.  We should not be lazy not to clean our kitchen and our utensils.  Unclean kitchen also contributes to unclean food. 
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