Heatwaves can lead to dehydration, heat stress, and reduced energy levels, especially when appetite decreases. People who fail to consume adequate fluids and nutrients may face risks such as heat exhaustion or heat stroke. High temperatures can also make heavy, greasy foods harder to digest, potentially causing discomfort. Vulnerable groups, including children, the elderly, and those with pre-existing health conditions, are particularly at risk during prolonged heatwaves.