The term that BEST describes non-fiction writers who create short pieces on topics such as food, travel, or medicine is "columnists."
Columnists are writers who specialize in crafting short, opinion-based pieces or articles on specific subjects. They often have expertise in a particular area and share their insights, perspectives, and commentary through their columns. Columnists can cover a wide range of topics, including food, travel, health, and other subjects of interest to readers. Their writing is typically engaging, informative, and reflects their own unique voice and viewpoint.