Eating with hand is always benifitial and scientific than eating with a spoon. It will be slight difficult to make understand a nonmedical person in this respect. Still if we clarify it simply that, we have many bacteria in our body- on the skin, in mouth, intestine called normal flora. Normal flora are usually harmless and protect us from many harmful bacteria from outside environment. We get these normal flora starting from after birth from mother skin and hands. Gradually many types of normal flora clonizes on different parts of our body. Maintenance of this colonization is needed for better health by updating the type of normal flora in our gut. If one use spoon (clean- bacteria free) for long time or drinks bottle water ( which is bacteria free) ultimately his pattern of normal flora will be changed or loss its current code of normal flora in the gut and he will loss his concomitant immunity to environmental bacterial pathogens. This type of people if suddenly exposed to a environment where water contains some sorts bacteria( that is not harm full to local people) will suffer a lot from gastroenteritis. As for example, in our country when some people come from abroad after several years of staying there mostly suffer from acute gastroenteritis within few days of coming here. Where as local people don't suffer from the disease with same foods and drinks or water.similarly people from urban area suffers when they visit villages after a long period.
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