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Our body is a mobile chemical factory that uses food, water, and oxygen as raw materials. These substances undergo a series of changes with the help of chemicals called 'enzymes' that are secreted by our body. 'Hormones' are another group of chemicals secreted in our body to control various activities. A strong acid called hydrochloric acid is produced in our stomach, which helps digestion. There are more chemicals in the food we eat than we find elsewhere. Some of them are carbohydrates, proteins, vitamins, fats, minerals, etc. These are vital to life.