Sugar can significantly affect mood and energy levels. Consuming high amounts of sugar leads to rapid spikes in blood glucose, resulting in an initial energy boost followed by subsequent crashes. These fluctuations can cause irritability, fatigue, and even anxiety. Moreover, excessive sugar intake can contribute to long-term conditions like obesity and depression. It is crucial to maintain balanced energy levels through a diet low in added sugars and rich in whole foods to support both mental and physical well-being.