The health effects of a high-sugar diet can be detrimental, leading to various health issues. Consuming excessive sugar increases the risk of obesity, type 2 diabetes, and cardiovascular diseases. High-sugar diets can also contribute to insulin resistance, leading to metabolic syndrome. Additionally, sugar can negatively impact dental health, causing cavities and tooth decay. The rapid spikes and crashes in blood sugar levels can lead to mood swings and fatigue. Thus, moderation and awareness of sugar intake are essential for maintaining overall health.