Americans nibble the equivalent of a fourth meal a day, according to Nutri-System.

It says a survey by MRCA Information Services showed that 80 billion snacks were consumed in 1986. Other findings showed beverages comprise 36 percent of between meal indulgences and sweets make up another 30 percent."Healthy" snacks account for only 16 percent and are favored by adults over 55. Oddly, singles between 18 and 24 snack the least while three or four member households snack the most.