Plant-based nutritional ingredients namely soya protein fibers and for use as a base ingredient in food products and dietetic products, specifically for flour, preparations made from cereals, pasta, bread, pastry and confectionery, edible ices, sauces as condiments, sandwiches, pizzas, pancakes, biscuits and cookies, cakes, rusks, chocolate, soya-based confectionery desserts, beverages based on cocoa, coffee, chocolate or tea