Excessive sugar can adversely affect physical energy levels by leading to rapid blood sugar spikes followed by crashes, resulting in fatigue and decreased performance. Over time, high sugar intake can contribute to insulin resistance, obesity, and associated health issues. It can also interfere with nutrient absorption and energy metabolism, causing exhaustion during physical activities. By reducing sugar consumption and focusing on balanced, whole-food sources of energy, individuals can maintain stable energy levels, enhancing both performance and overall health.