Refined carbohydrates are considered unhealthy because they are highly processed and stripped of fiber, vitamins, and minerals. This makes them rapidly absorbed by the body, leading to spikes in blood sugar levels, energy crashes, and cravings. Refined carbohydrates are also often high in added sugars and unhealthy fats, contributing to weight gain and other health problems if consumed in excess. Refined carbohydrates include white bread, pasta, pastries, and sugary breakfast cereals. Consuming refined carbohydrates regularly can also increase the risk of chronic diseases such as type 2 diabetes, obesity, and heart disease. It is recommended to limit the intake of refined carbohydrates and choose whole grain options, such as whole wheat bread and brown rice, to ensure a balanced and nutritious diet.