Extreme heat is affecting people's mental and physical health, causing limited energy and increased stress. A psychiatrist notes that high temperatures can lead to lower serotonin levels, resulting in feelings of unhappiness, irritability, and anger.

A food truck vendor in Dallas has observed the impact of heat on customers, describing them as tired and no longer smiling. The vendor has also seen a slump in the lunch rush at Klyde Warren Park.

Further details on the effects of heat on mental and physical health are available from a local psychiatrist, who explains the physiological and emotional impacts of extreme temperatures.