Ingredients on food labels should be listed in order of
a. highest concentration to lowest concentration
b. carbohydrates, fats, and proteins
c. descending order by weight
d. fats, carbohydrates, and proteins

C. descending order by weight. The standard rule in food labeling guide is to list ingredients in order of weight. The first ingredient being the one that weighs the most, and the last ingredient that weighs the least. Water should also be included in the list of ingredients unless it's less than 5 percent of the product.