The present invention relates to a dietary composition produced by a process involving extruding a milk containing product (e.g., milk, milk concentrate, milk protein concentrate, whey, whey concentrate, whey protein isolate, whey protein concentrate) through an extruder at about 50 about 450 rpm and at a temperature of about 40° to about 120°C to produce the dietary fiber composition (which contains partially or totally denatured milk containing product). The present invention also concerns a food product containing at least one food ingredient and the dietary composition described herein for example the dietary composition containing partially denatured proteins may be used to create a fully cooked, totally expanded or puffed ready-to-eat snack food product (or pellets or half products). In addition, the present invention relates to a method of making a food product, involving adding the dietary composition described herein to one or more food ingredients or adding one or more food ingredients to the dietary composition described herein. Furthermore, the present invention concerns a method of increasing fiber in the diet of a mammal, involving feeding to the mammal the fiber enriched food product described herein.Linvention concerne une composition alimentaire produite au cours dun procédé consistant à extruder un produit laitier (par exemple du lait, du concentré de lait, du concentré de protéine laitière, du lactosérum, du concentré de lactosérum, de lisolat de protéine de lactosérum) au moyen dun extrudeur à environ 50 à 450 rpm et à une température denviron 40° à 120 °C afin de produire la composition fibreuse alimentaire (qui contient un produit laitier partiellement ou totalement dénaturé). Cette invention se rapporte aussi à un produit alimentaire contenant au moins un ingrédient alimentaire et la composition alimentaire susmentionnée par exemple, cette composition alimentaire contenant des protéines partiellement dénaturées peut servir à fabriquer un prod
