If you use the same set of bed linen for too long, pathogens and / or fungi can accumulate in it, which can provoke the development of a wide variety of diseases and allergic reactions, says microbiologist Philip Tierno from New York University..

The human body produces approximately 98 liters of sweat per year in bed.. During the warm season, this humid environment becomes an ideal place for fungal colonies to thrive.. Therefore, bed linen should be changed at least once a week, according to the expert..

In a recent study that assessed the levels of fungal contamination in bedding, scientists found that feather and synthetic pillows with a lifespan of 1.5 to 20 years can contain four to 17 different types of fungi, many of which can be pathogenic..

In addition to fungi and bacteria, your bed becomes contaminated with sweat, mucus, dead skin cells, vaginal and anal secretions, as well as dandruff and dust. This environment is also inhabited by a dust mite, whose excrement also falls on bed linen..

In just a week, the amount of these pollution becomes quite significant, says Philippe Tierno. Some components of this mud can cause allergies, asthma, skin problems, and problems with nails and hair..

“If you accidentally touch dog feces on the street, you probably want to wash your hands afterwards.? Apply this analogy to your bed. If you saw what is there (although you don’t see it), you would certainly ask yourself if you want to sleep in it,” Professor Tierno concluded..

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