Association between ultra-processed foods and risk of cancer: a systematic review and meta-analysis

The Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) statement, published in 2009, was designed to help systematic reviewers transparently report why the review was done, what the authors did, and what they found. Over the past decade, advances in systematic review methodology and terminology have necessitated an update to the guideline. The PRISMA 2020 statement replaces the 2009 statement and includes new reporting guidance that reflects advances in methods to identify, select, appraise, and synthesise studies. The structure and presentation of the items have been modified to facilitate implementation. In this article, we present the PRISMA 2020 27-item checklist, an expanded checklist that details reporting recommendations for each item, the PRISMA 2020 abstract checklist, and the revised flow diagrams for original and updated reviews.

The relative importance of cardiovascular disease (CVD) and cancer as leading causes of premature death are examined in this communication. CVD and cancer are now the leading causes in 127 countries, with CVD leading in 70 countries (including Brazil and India) and cancer leading in 57 countries (including China). Such observations can be seen as part of a late phase of an epidemiologic transition, taking place in the second half of the 20th century and the first half of the present one, in which the dominance of infectious diseases is progressively superseded by noncommunicable diseases. According to present ranks and recent trends, cancer may surpass CVD as the leading cause of premature death in most countries over the course of this century. Clearly, governments must factor in these transitions in developing cancer policies for the local disease profile.