Primary care medical doctor (PHC) have a chance to sustenance the healthy eating behaviors of patients by giving nourishment education. This study aimed to explore the updated evidence concerning physicians' knowledge and practice of nutrition education in healthcare centers in Saudi Arabia. A systematic review was conducted. We searched PubMed, Web of Science, Science Direct, EBSCO, and the Cochrane library. Using Rayyan QCRI, study articles were first screened by title and abstract before a full-text analysis was done. Results: This review included a total of 8 research with participants of both sexes and varying ages. The included studies used a variety of designs, mostly cross-sectional, but they are all legitimate. the main evidence demonstrated by most of the reviewed studies is that primary care physicians have just a reasonable nutrition knowledge and are aware of the only basic nutritional knowledge for providing nutrition care to their patients. Medical students' knowledge, attitudes, and confidence in offering nutritional counselling to patients all showed how inadequate the nutritional programme was. So, Intern physicians and Primary care physicians need to improve their clinical nutrition knowledge, this will allow them to get the most level of nutritional knowledge and skills to provide individuals with the suitable nutritional recommendations and also successfully support patients to enhamce their dietary behaviors and health conditions. PHC physicians should have continuous nutrition educational training programs to ensure the continuous provision of sound nutritional advice to patients and the public leading to a positive impact on public health.