“…These diets are composed of refined, invariant, and restricted set of ingredients, which offer less variable and more easily controlled experimental conditions. Additionally, the use of purified or synthetic diets instead of natural ingredient chows, gives more precise control over the metabolizable energy, dietary composition of nutrient, and provides better repeatable experimental conditions (Ritskes-Hoitinga, 2001;Thigpen et al, 2002;Odum et al, 2004). However, it is still an open question if the experimental diet should be a standard for the chosen species or should mimic human Western diet with regard to fat, fibre, and calcium content.…”