A blood sugar spike after eating occurs when glucose levels rise rapidly due to the digestion of carbohydrates. This is common after consuming sugary or high-carb meals, especially those low in fiber or protein. In healthy individuals, insulin helps bring glucose back to normal levels. However, frequent spikes can strain the body’s insulin response and may lead to insulin resistance or type 2 diabetes over time. Symptoms may include fatigue, thirst, or blurred vision. Managing spikes involves choosing complex carbs, adding protein and fiber to meals, and staying active. Monitoring post-meal glucose helps prevent long-term health complications.