Unfortunately, fast foods are not entirely free of nutritional drawbacks: Most contain excessive amounts of sodium (principally in salt), sugar and fat. fat contributes about 50 percent of the calories in fried fish, chicken and potatoes, and sugar supplies about half of the roughly 300 calories in a 10 ounce shake. The frothy shake also contains about .01 ounce, or 300 milligrams, of sodium: if consumed with, say half a 10-inch pizza or with a cheeseburger, the sodium intake skyrockets to about .05 ounce, or 1,300 milligrams as much as an adult needs in a day.