Refined carbs, also known as processed carbs, are carbohydrates that have been stripped of their nutrients and fiber during processing. They are considered "empty" calories because they provide very few vitamins and minerals. Refined carbs include mostly sugars and processed grains, such as white flour made from refined wheat. The two main types of refined carbs are refined sugars and refined grains. Examples of refined carbs include white bread, white rice, pastries, sodas, snacks, pasta, sweets, breakfast cereals, and added sugars.

Refined carbs are digested quickly by the body, leading to rapid spikes in blood sugar and insulin levels. This can contribute to high blood sugar and overeating. Eating too many refined carbs may cause health problems, including an increased risk of type 2 diabetes and heart disease.

In contrast, unprocessed carbs contain fiber, vitamins, and minerals, and are an important part of a balanced diet. Examples of unprocessed carbs include fruits, vegetables, whole grain bread, brown rice, and beans. Choosing complex, unrefined, or "good" carbs such as these can result in stable blood sugar and less fat accumulation.

To summarize, processed carbs are carbohydrates that have been stripped of their nutrients and fiber during processing. They are considered "empty" calories and can contribute to high blood sugar and overeating. Examples of processed carbs include white bread, white rice, pastries, sodas, snacks, pasta, sweets, breakfast cereals, and added sugars. In contrast, unprocessed carbs contain fiber, vitamins, and minerals, and are an important part of a balanced diet.