Cold beverages like ice water and black‑bean tea can harm health when misused

Drinking ice‑cold water does not lower body temperature; the sudden chill causes blood vessels in the stomach and intestines to contract sharply, slowing circulation, increasing the body’s effort to re‑warm the fluid and potentially leading to dehydration, heightened thirst, fatigue, fainting, or even heat‑shock and stroke if consumed after intense heat exposure or exercise. Repeated intake can irritate the throat, provoke gastrointestinal cramps, and trigger severe headaches or vascular incidents during sleep.

Black‑bean water, popular as a summer refresher and weight‑loss aid, contains high levels of phytate, a compound that binds minerals such as iron, zinc and calcium. Regular over‑consumption can impair nutrient absorption, causing anemia, reduced bone density and weakened immunity. Consuming it on an empty stomach, near bedtime, or with mineral‑rich foods can irritate the stomach lining, cause bloating, diarrhea, and disturb sleep. Both drinks, while appealing for their cooling effect, carry significant health risks when taken in excess or at inappropriate times.