Traditionally, it is believed that a trip to the sea is the best way to "reboot" the body, strengthen the immune system and gain strength for the whole year. We expect that the sea and health are inseparable concepts. However, gastroenterologists and dermatologists record different statistics: after returning from sea resorts, thousands of people complain of acute bloating, bowel movements, skin rashes, exacerbation of allergies and inexplicable fatigue.