Before revision:  Thus, the following paper presents a brief review of visual-based methods for food recognition , including their accuracy, performance, and the use of popular food databases to evaluate existing models. The work further aims to highlight future challenges in this area .
After revision:  Thus, the following paper presents a brief review of visual-based methods for food recognition . The core of the paper is the presentation, discussion and evaluation of these methods on popular food image databases. We also discussed the mobile applications that are implementing these methods. The review ends with a discussion of research gaps and future challenges in this area .