The terms food critic, food writer, and restaurant critic can all be used to describe a writer who analyzes food or restaurants and then publishes the results of their findings. While these terms are not strictly synonymous they are often used interchangeably, at least in some circumstances. Those who share their opinions via food columns in newspapers and magazines are known as food columnists.
"Food writer" is often used as a broad term that encompasses someone who writes about food and about restaurants. For example, Ruth Reichl is often described as a food writer/editor, who in the course of her career served as the "restaurant critic" for The New York Times and for the Los Angeles Times. R.W. "Johnny" Apple was also described as a food writer, but never served as a designated restaurant critic. Nonetheless, he wrote frequently about restaurants as he traveled in search of good eats. Calvin Trillin writes a great deal about food (among other things) and has been known to write occasionally about specific restaurants, e.g., Arthur Bryant's and Diedee's. But restaurants figure less prominently in his writing than in Apple's. Finally, Richard Olney was also a noted food writer, but rarely if ever wrote about restaurants.
Food critics and "restaurant critic" are synonyms, in practice, although there is still a distinction to be made. Both suggest a critical, evaluative stance that often involves some kind of rating system. The distinction, if any involves the range of possible investigation. "Food critic" has a more contemporary vibe, suggesting that restaurants, bakeries, food festivals, street vendors, and taco trucks are all fair game. Jonathan Gold, of the L.A. Weekly, exemplifies this trend. "Restaurant critic" is the more traditional title and can connote a more restricted sphere of operations — traditional restaurants, with perhaps those serving French cuisine being the examplars. The change in practice, if not in terminology, is often attributed to Reichl's arrival at The New York Times, replacing Bryan Miller. In a series of well-documented incidents, Miller complained that Reichl was, "...giving SoHo noodle shops 2 and 3 stars" and destroying the rating system that had been built up by Craig Claiborne, Mimi Sheraton, and Miller.
Notable food critics 
For most of the past century, the most highly visible food critics have been those who have written for daily newspapers throughout the world and a few who have been restaurant reviewers for influential magazines, such as Gourmet in the United States. The ephemeral nature of radio and television has meant that very few food critics have used this medium effectively (as opposed to chefs who have used all media to great effect). An example is the BBC's The Food Programme. Hugh Fearnley-Whittingstall has also used both broadcast media and print to concentrate on food production rather than presentation, starting a new column in The Guardian in September 2006.
Restaurant critics range in their approach to writing from the acerbic (such as A. A. Gill from London), to the witty/humorous (such as Morgan Murphy (journalist), "America's Funniest Food Critic," or Terry Durack from "The Independent on Sunday") to the "been there done that" approach of Ruth Reichl of Gourmet and formerly of The New York Times. Other notable critics include Patricia Wells of the International Herald Tribune, who writes knowledgeable and perceptive articles about food and restaurants and who occasionally uses the sword rather than her usual suave style. Another was R. W. Apple, Jr., from The New York Times, who wrote long, thoughtful articles about his travels throughout the world in search of great food. Brad A. Johnson in Los Angeles is the only American restaurant critic to win both the coveted James Beard Award and the Le Cordon Bleu World Food Media Award for restaurant criticism.
Then there are myriad regional food critics, ranging from Nancy Leson in Seattle, to Pat Nourse in Sydney, and Stephen Downes and John Lethlean in Melbourne, who pen weekly and monthly reviews of the best of their respective cities.
Recently in Iceland the fast food critic Hákon Dagur Guðjónsson has been stirring up controversies with his brutal criticism on Iceland fast food chains. Among those who have faced his harsh judgement are well established fast food chains American Style, Serranos and Subway. His take on Serrano's caused their CEO, Emil Helgi Larusson, to comment in the comment section where he vowed to take the criticism into consideration. Most recently Guðjónsson called Subway an "insult to humanity" and criticized the staff for being unfriendly which led a heated debate in the comment section.
Food criticism on the internet 
More recently, a new generation of discussion forums and rating systems have become influential such as Mouthfuls, Yelp, and eGullet, as have some food criticism blogs like GrubGrade, The Impulsive Buy, Foodette Reviews and Robin Goldstein's consumer-oriented website and book series Fearless Critic.