This guide in conducting systematic literature reviews was developed for the revision of the 4th edition of the Nordic nutrition recommendations (NNR5 project) by the NNR5 working group. The aim of the guide is to give instructions on how to conduct systematic literature reviews for the experts engaged in the NNR 5 project. It is a working document and has been submitted to and approved of by the NNR 5 reference group that consists of senior experts representing various fields of nutrition science, both within and outside the Nordic countries.