Study selection
Titles and abstracts of all relevant searched papers were read and were eliminated if they do not fulfill our inclusion criteria. The study was excluded if it was from one of the following criteria: (1) The article is irrelevant to the purpose of the study. (2) The article is a review paper. (3) The article does not include the relevant vegetable oils. (4) The article does not have the relevant intervention. (5) The article does not have a relevant comparison group (control group). (6) The article does not discuss the outcome that is relevant to this research. (7) The article uses a non-standard format or is not published online. (8) The article is not in English and cannot be translated. (9) The article is not included in the year range of 2000 – 2020. (10) The article is duplicated or replicated. Study papers were rejected if they fulfilled even only one clause of the scheme above and they were mentioned as the main reason for rejection.