I lost 65 lbs to be in the lowest healthy BMI index instead of a BMI of 31 and started eating more protein less carbs more Paleo style but not a purist by any means. I also went to a reproductive immunologist who determined that I have 2 very severe blood clotting issues. If I don't get on blood thinners when I get pregnant I increase my risk of having a blood clot at least 6 fold, putting my life at danger as well as baby's. Once I did the things the immunologist was asking, after 6 years, 3 ivf's and 3 donor egg ivf's later, we got pregnant naturally.
There are major immune issues at play when we try to get pregnant. If we're over weight, our hormones, which are for the most part fat soluable, don't function well. If we have Chrones, arthritis, Thrombophelia in the family genetics, we're very very likely to have issues getting and staying pregnant due to immune issues. I don't believe in homeopathy, but I do believe that a low carb diet and lots of exercise has made the difference allowing me to get pregnant the handful of times that it's happened. The diabetes association has done studies on how high carb and high sugar diets effect egg quality and no wonder why we have so much infertility these days! And I'm a firm believer that the more a person reads (that's scientifically backed of course) the more you're likely to understand what's hindering your success. For me I was diagnosed with premature ovarian failure and being over weight and eating a high carb diet that killed any chance of me getting pregnant. As soon as I lost the weight, ate high quality veg & protein, cut the carbs & sugar, exercised lots I got pregnant naturally 3 times. The last time I was able to hang onto the pregnancy by figuring out that I have blood clot issues. When we get pregnant our blood clotting rates increase two to three fold naturally anyway with the change in hormones. But with Thrombophelia and AntiPhospholipid Antibodies you reach extreme mc territory during pregnancy (so I take Celexane injections anytime I get pregnant now to prevent mc and dangerous clots).