Core Viewpoint - The article highlights the increasing health risks associated with high temperatures, particularly focusing on heat stroke and cold-induced heat illness, and emphasizes the importance of preventive measures and timely medical intervention [1][2][5]. Group 1: Heat Stroke - Heat stroke is characterized by a core body temperature exceeding 42°C, leading to significant organ dysfunction and potential death [2]. - The condition arises when the body's temperature regulation fails, causing cellular energy metabolism disruption, particularly affecting vital organs like the heart, liver, and kidneys [2][3]. - Preventive measures include regular hydration of 200-300 milliliters per hour, balanced nutrition, and avoiding outdoor activities during peak heat hours [3][4]. Group 2: Cold-Induced Heat Illness - Cold-induced heat illness occurs when individuals transition from a cold environment to a hot one, causing symptoms like dizziness and nausea due to rapid temperature changes [5][6]. - To prevent this condition, it is advised to gradually adjust to temperature changes, maintain a maximum temperature difference of 5°C between indoor and outdoor environments, and ensure adequate hydration [7][8]. - Symptoms of cold-induced heat illness can be alleviated by loosening clothing, ensuring ventilation, and consuming small amounts of warm water [7][8].

Core Viewpoint - The article discusses the health implications of consuming cold foods like ice cream during hot weather, highlighting a phenomenon known as "brain freeze" or "ice cream headache" that can occur after eating cold treats [1][10]. Group 1: Health Effects of Cold Foods - Consuming cold drinks can stimulate the parasympathetic nervous system, reduce autonomic nervous system disorders, and enhance digestion by promoting gastrointestinal motility and increasing appetite [7]. - "Brain freeze" is characterized by intense pain in the forehead and temples, lasting from a few seconds to a maximum of 2-5 minutes, and may be accompanied by nausea and vomiting [10]. - The condition can occur after consuming cold foods in two scenarios: eating cold treats quickly or drinking cold beverages after intense physical activity, which can irritate cranial blood vessels [12]. Group 2: Recommendations for Consuming Cold Foods - It is advised to consume cold drinks during midday when the body's yang energy is strongest, ideally after meals rather than on an empty stomach [15][17]. - When consuming cold foods, it is recommended to take small amounts, allowing them to warm in the mouth for 3-5 seconds before swallowing, and to avoid excessive consumption in a short period [17]. - Individuals with a history of migraines or children with underdeveloped temperature regulation should be cautious with cold food consumption [17].

Group 1: Weather Impact - A strong heatwave is affecting multiple provinces in China, with high temperatures expected to persist, particularly in Jiangsu, Zhejiang, Fujian, Jiangxi, Hunan, Guangdong, Guangxi, and others [1] - The Central Meteorological Observatory issued a yellow alert for high temperatures, predicting daytime temperatures above 35°C in various regions including North China, Huanghuai, Jianghuai, Jiangnan, and parts of Xinjiang [1][4] - The maximum electricity load in China reached a historical high of 1.465 billion kilowatts on July 4, 2023, an increase of nearly 150 million kilowatts compared to the same period last year [1] Group 2: Meteorological Analysis - The current high temperature and humidity levels are considered unusual for this time of year, with significant heat observed in northern regions before the traditional "Minor Heat" period [2] - The phenomenon is attributed to the early northward movement of the subtropical high-pressure system, which has led to widespread high temperatures and moisture transport from the ocean [2] Group 3: Health Concerns - There has been an increase in cases of heat-related illnesses such as heat stroke, with reports of patients experiencing severe symptoms due to prolonged exposure to high temperatures [5][7] - Recommendations for preventing heat-related illnesses include avoiding outdoor activities during peak heat hours, wearing light clothing, and staying hydrated with electrolyte-rich fluids [8][10]