Generally speaking, foods that grow from the earth contain carbohydrates. These foods come in various textures and flavors and with varying amounts of nutritional value. Most of these foods, as is, are going to be healthy sources of carbohydrates. These are minimally processed foods that contain fiber and offer a generous amount of vitamins and minerals.
Minimally processed means that we’re eating these foods in a form that’s close to how they were grown. This essentially means you clean the food, cut it, and cook it. A little olive oil and seasoning would still be considered minimally processed.
However, foods that start out as healthy carbohydrates can quickly become less healthy options depending on how they are processed and prepared. Let’s look at potatoes for example. Simply sliced and roasted potatoes offer a variety of vitamins and minerals, however, when they're turned into french fries or potato chips their nutritional value is overshadowed by saturated fats, increasing the caloric density and fat content significantly. It's not that these foods can't be included as part of a healthy lifestyle, they just shouldn't be the foundation of your diet.