Loyola University in Chicago has found that iced teas are high in oxalates, a risk factor for kidney stones. In people prone to the disease, the consumption of such drinks is very dangerous.

One of the causes of nephrolithiasis is insufficient fluid intake. In summer, due to the high temperatures, people become dehydrated and often resort to the soft drink in industrial quantities. Thus, even increased fluid intake proves to be a harmful factor.

Lemons are rich in citrates - substances that inhibit the formation of stones. Their consumption is recommended, for example, in the form of lemonade (but made at home, not a finished product). Water, on the other hand, should be the main means of quenching thirst. Foods rich in oxalates are spinach, chocolate, nuts and more.