An example of the lack of consensus may be found in the study: Schwingshackl, L., & Hoffmann, G. (2013). Comparison of effects of long-term low-fat vs high-fat diets on blood lipid levels in overweight or obese patients: A systematic review and meta-analysis. Journal of the Academy of Nutrition and Dietetics, 113(12), 1640-1661. doi: 10.1016/j.jand.2013.07.010