I think it's critical to include fat in one's diet. We have unfortunately been told lies about saturated fat being bad, you need just examine in details the studies and you will see for yourself. Fat is required for many functions in the body, cholesterol is also critical for cells. Fat is also satiating and contrary to popular belief, more fat, less carbs = weight loss not weight gain. The documentation on that is extensive and VERY convincing.
Check out Gary Taubes, Jeff Volek, Mary Enig, Sally Fallon, Peter Attia, Stephen Phinney, Zoe Harcombe, Anthony Colpo, Nina Teicholz, Cholesterol Skeptics site, Vilhjalmur Stefansson, Robert Atkins.