It has concerned me for years that a woman's body, however amazing and wonderful it is, simply cannot make a healthy baby from a diet of High Fructose Corn Syrup and hydrogenated fats.
But you are perfectly correct, helen1, there have been many unusual experiments carried out by nature itself.
I suppose the Dutch famine wasn't directly relevant to this study, which had actual measurements from before birth cohorts, but it is something which would have been relvant, if mentioned in the discussion.
However, it's only really in social sciences such things do get included.
In scientific papers, they tend to be a lot less "wordy", they concentrate on the issue and being concise.