Diet Terminology and History of Insect Diet Science
Singh (1977) pointed out that diet terminology has been used in very imprecise and ambiguous ways such as authors calling diets “containing starch, casein or wheat germ described as ‘chemically dened.’” Singh goes on to say that “To some authors, a ‘synthetic’ diet is a mixture of nutritive substances, with perhaps a plant preparation with yeast, or vitamins or sugar added; to others it is a mixture of pure chemicals only.” Dougherty (1959) provided a concise and logical set of denitions that have been used by many authors to give consistent meanings to diet formulation terminology. Dougherty described holidic diets as ones whose components are completely known and oligidic diets as ones whose components are not fully or even nearly well characterized. Meridic diets fall in between, with some components well characterized (or dened) and others poorly dened. Meridic diets can be considered intermediary between holidic diets and oligidic diets (Dougherty 1959). However, these terms retain ambiguity when it comes to nuances of purication. Soy protein is closer to being dened than soy meal; the extraction process involved in producing soy protein has removed many lipids, complex carbohydrates, sugars, and other components of soy meal (or soy our), but the proteins are mixed, rather than a single protein species, and there are some lipids, sugars, and minerals that are present in soy protein preparations.