Probably depends on the person. Beef made a huge difference for me in comparison to my previous diet which had very little meat in it because I never liked it but plenty of dairy, eggs, lentils, broccoli, beans, potatoes and some fish eaten according to my day to day tastes. I read somewhere that meat could be used in monodiet and after making myself eat beef which turned out to be surprisingly easily digestible and satiating I am inclined to believe it.