Serving size-one study conducted by the international food information council found that only 55% of americans are concerned with serving sizes on labels; however, serving size should be the first thing you read when determining how healthful or caloric a food really is. reading the other numbers on a food label is nearly useless without knowing how much of the food theyre referring to. many packaged foods may appear to be a single serving but can contain several servings according to the label. without looking at serving size, you could be eating double or triple the calories and fat without realizing it!