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Caffeine and sugar like coffee or soda are viewed to become the common and preferable food for overnight employees because such food is able to reduce the tired feeling and help workers stay awake. However, caffeine can result in sleep disorder in the daytime, and individuals working through the night could possibly get with insomnia which causes bad eating habits. Thus, nightshift people should take caffeine amount into consideration with regard to their own health. Those that support animal testing say that is a necessary practice. They mention that firms that count on animal testing do use humane techniques to feed, house and care for the animals. Supporters also claim that options to animal testing are certainly not as far reaching, lacking a chance to figure out how cosmetic products affect living tissue and organs. Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System.