Lifestyle diseases are health conditions that are primarily caused by unhealthy habits and choices. Common examples include heart disease, diabetes, and obesity. These diseases often result from factors such as poor diet, lack of physical activity, smoking, and excessive alcohol consumption. Preventing lifestyle diseases typically involves making healthier choices, such as eating a balanced diet rich in fruits and vegetables, engaging in regular exercise, and avoiding harmful substances. By adopting a healthier lifestyle, individuals can significantly reduce their risk of developing these conditions and improve their overall well-being.