The nev-er developments in the field of nutrition have indicated that some of the most important elements in our diets, invisible and undetectible by the senses of taste and smell, are lost during the cooking of foods. These are the vitamins and the essential minerals. Prior to these newer developments, the primary function of cooking was to prepare foods in an edible form. In order to preserve the nutritive value of foods, the cook must now look to the nutritionist to ascertain what effects the various operations in the preparation and cooking of foods may have upon the retention of the vitamins and minerals and how these procedures can be so modified as to retain these essential nutrients to the maximum without sacrifice of palatability and appearance.Most of the studies in this field have been concerned solely with vitamin C losses. This v-as due to the availability of a chemical method for ascorbic acid analysis while the laborious, costly, and less precise biological procedures were required for the assay of the other vitamins. With the advent of rapid and inexpensive chemical and microbiological test methods, attention was directed toward evaluating the fate of nutrients other than ascorbic acid in cooked foods. These studies, reviewed by Kohman (19421, were confined to a limited number of factors in one or two different typesThe present study was undertaken to determine the difference in degree of retention of vitamins and minerals as affected by variations in culinary methods. Analyses were conducted for the carotene, thiamin, ascorbic acid, riboflavin, nicotinic acid, iron, calcium, and phosphorus contents of four representative vegetables before and after cooking.The typical vegetables selected were peas, potatoes, carrots, and broccoli representing, respectively, legumes, tubers, roots, and in the last case, leaves, stems, and flowers. Purchases mere made in the open market of the freshest vegetables obtainable during the midsummer season. The cooking experiments were conducted on the same mornings that the purchases were made.Two cooking methods were used, one concerned simply with the preparation of the vegetables in edible form, the other based on a procedure designed also to favor retention of the essential nutrients without sacrifice of palatability. For convenience, the first will be referred to in the present study as the "old-fashioned" procedure and the other as the "new-improved'' method of cooking. In the case of the old-fashioned method large proportions of water v-ere used to show the results obtained when no care is observed in the direction of preserying the nutritive elements, as in the of foods.'This study is one of a series, sponsored by the Westinghouse Electric and Manufacturing Company, Mansfield, Ohio, as part of its Health for Victory Club program.
115