What could happen to a person's body as a result of unhealthy eating and a sedentary lifestyle?

A buildup of cholesterol plaque in the bloodstream is a significant consequence of unhealthy eating and a sedentary lifestyle. When individuals consume a diet that is high in saturated fats, trans fats, and cholesterol, combined with low levels of physical activity, it can lead to elevated levels of low-density lipoprotein (LDL) cholesterol in the blood. Over time, this excess cholesterol can accumulate on the walls of arteries, forming plaque. This plaque buildup narrows the arteries, making it harder for blood to flow and increasing the risk of cardiovascular diseases, such as heart attacks and strokes.

In contrast, the other options describe scenarios that are unlikely to occur as a result of unhealthy habits. For instance, a well-regulated digestive system and balanced energy input and output are typically associated with a healthy lifestyle, not one characterized by poor dietary choices and inactivity. Cells require adequate nutrition and energy to perform their functions, and a lack of healthy foods and physical activity can significantly impair cellular function and repair processes.