This is a very bad habit . There are many people who do not get food to eat . We should even think about them . It is very bad to throw food items and eatables in the dustbin . We should be thankful that we get food to eat and we are not supposed to waste food by throwing in away . 
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Throwing eatables in dustbin shows the bad behaviour of a human being towards food. It is not only very bad but dangerous too. It can cause the attack of mosquitoes and houseflies near the dustbin which can speed harmful diseases like malaria ,dengue etc... This also shows the carelessness of the students.