Results Conclusions and Relevancehttp://archinte.jamanetwork.com/article.aspx?articleid=2553283
Why does morning sickness go along with a pregnancy that is less likely to miscarry? I think it is because a lack of hydrogen sulfide, which is necessary to good placental blood vessel development as mentioned in yesterday's post, causes there to be a lower level of toxic sulfite--a hydrogen sulfide product--in the abdomen. An accumulation of sulfite is irritating to mucosal lining in the gastrointestinal tract, thus bringing on nausea and vomiting. Therefore, a pregnancy that isn't developing well is less likely to bring on NVP.
Does that mean that a woman without NVP needs to be frightened that she'll miscarry? The answer to that depends on how good her body is at breaking down sulfite. If she is making enough hydrogen sulfide for a healthy pregnancy but is also breaking down the resulting sulfite quickly, then she will likely have little or no NVP. But if her body is not making enough hydrogen sulfide, that would appear to be a bad portent for the pregnancy's outcome.
For more information on this theory, please see my YouTube video at https://www.youtube.com/watch?v=TaweHPbUPL0.