Sugar has a significant impact on energy levels and mood swings. When consumed, sugar can cause a rapid increase in blood sugar levels, leading to a surge in energy. However, this spike is often followed by a sudden drop in blood sugar, which can result in fatigue, irritability, and mood swings.

For example, a study published in the American Journal of Clinical Nutrition found that consuming high levels of sugar-sweetened beverages was associated with a higher risk of depression in adults. This suggests a link between sugar intake and mood disturbances.

Furthermore, excessive sugar consumption can also contribute to long-term health issues such as obesity and type 2 diabetes, which can further impact energy levels and mood stability.

It's important to be mindful of sugar intake and opt for healthier alternatives to maintain a balanced energy level and stable mood.