CR affect on menstruation and amenorrhea? in CR Practice Posted February 29, 2016 · Report reply Thanks for the excellent resources Dean. I appreciate that information! It is very helpful! I am naturally very concerned about bone health, and I am glad to see what has been found about it. Thanks for chiming in Liz. I am glad to know that you had 5 years of CR without amenorrhea. 17% seems like a good body fat % and I am glad that the hormonal cycles were not affected at that level.