The government announced Friday that the cost of food had gone up yet again. This came as no revelation to Bruce Newton, a single father of two children.

As he wheeled a cart full of groceries out of a Stop & Shop supermarket in Bloomfield, N.J., on Thursday night, Mr. Newton complained that the price of chicken had become “outrageous,” and eggs were so costly his mother sent him from store to store hunting for the cheapest ones. Essential breakfast items like milk, cereal and orange juice have become “so expensive, but what are you going to do?”

Mr. Newton’s pain is being felt in grocery checkout aisles across the country. Government figures released Friday showed that grocery costs had jumped 5.1 percent in 12 months, the latest in a string of increases. In fact, the nation is undergoing its worst grocery inflation since the early 1990s.

With a few exceptions, nearly every grocery category measured by the Labor Department, which compiles the official inflation numbers, has increased in the last year. Milk is up 17 percent, as are dried beans, peas and lentils. Cheese is up 15 percent, rice and pasta 13 percent, and bread 12 percent.