The term extender is often used for protein-rich ingredients, whereas filler refers mainly to powders with a high carbohydrate content. A wide range of ingredients can be used, both as fillers and extenders for food: grain flour, cellulose, oats, or olive stone flour. In foods where the extender/filler is also supposed to add nutritional properties, chia seeds, chinoa or ground beans are also popular options. Certain foods also contain mineral powders such as precipitated silica.