A 2007 Oxford Academic study looking at high intake of low fat dairy showed an increased risk in infertility. Nutritionist and dietician Mor Levy Volner, R.D.N., I.B.C.L.C., M.S., works with a lot of new moms and told POPSUGAR "dairy is the number one food I will remove [from their diets] that has the most impact with regards to my clients' fertility. Usually the first thing I recommend doing is eliminating dairy protein from their diet. I've seen the best results from this simple adjustment."