And because it's dissolved, it passes more easily across gills and into digestive systems.

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Premature infants, who make up two-thirds of infant deaths, often suffer serious health problems at birth, with undeveloped lungs, organs and digestive systems.

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The larvae of the cheese fly (Piophila casei) are added to the cheese, and the acid from their digestive systems breaks down the cheese's fats, making the final product soft and liquidy.

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The bacteria that caused the recall is a strain of Escherichia coli, a bug that swims by the trillions in the digestive systems of people, cows and other mammals and is vital to digesting food.

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Pollution also poses a threat: floating plastic bags look a lot like the jellyfish they rely on as their main food source, and have been found in the digestive systems of about half of the leatherbacks studied in recent times.

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