NEW YORK—Food companies are coming under renewed pressure to use less salt after U.S. regulators spelled out long-awaited guidelines aimed at reducing sodium levels in dozens of foods including condiments, cereals, french fries, and potato chips. The voluntary goals that were finalized on Wednesday for 163 foods are intended to help lower the amount of salt people eat. A majority of the sodium in U.S. diets comes from packaged or restaurant foods—not the salt added to meals at home—making it hard for people to make changes on their own. To get people used to eating less salt, the Food and Drug Administration said reductions have to be gradual and across the entire food supply so people don’t keep reaching for higher sodium options. “By putting out the targets, that really helps to level the playing field across the industry,” said Susan Mayne, director of the FDA’s food safety and nutrition …