This species is an omnivorous one, meaning that it eats animals, plants, or anything that is available for it to consume. Since Periplaneta americana does not have mouthparts that are specialized to eat certain things, it can eat hard or soft materials and can drink any kind of liquid. However, it mostly feeds on garbage or any sort of decaying organic matter, although its favorite foods consist of anything that is either sugary or starchy. This cockroach invades homes and eats whatever is left out, which poses a danger because it can contaminate the food that it touches, leaving infectious material for the human living in that home. This cockroach can survive one month without eating, as long as it consumes water. If there is no water, then fresh fruits are a good source of liquid for it to drink. However, it will die in two weeks if it is not provided with either food or water (Cornwell 1968; Lyon 2000).
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