Oooo! I did a different search and found some more articles! I'll just type the pertinent part of the abstract for each one. Some appear to contradict each other - but you know that's just how it goes sometimes with these studies.
1. The current study suggests that high intakes of energy, sucrose, and polyunsaturated fatty acids independently increase the risk for preeclampsia.
2. Recent, large, randomized trials have not shown a benefit from the use of aspirin. Calcium supplementation has also been studied extensively and found to be similarly ineffective in reducing the incidence or severity of preeclampsia in healthy women. The studies regarding the use of magnesium, zinc, and fish oils for the prevention of preeclampsia are fewer in number, but have also found minimal to no benefit. In the same respect, numerous randomized trials have been performed using antihypertensive agents, diuretics, and low-salt diet. Results of these studies have not shown any beneficial effect. Prevention of preeclampsia is unlikely as long as the underlying origin remains unknown.
3. We found no evidence that low vitamin E consumption is related to the development of preeclampsia.
4. Logistic regression analysis showed that women who drank two glasses of milk per day had the lowest risk (reference category). The relative risk (RR) for those drinking one glass of milk per day was similarly low, but risk for those drinking less than one glass of milk per day was substantially higher. Women drinking three or more glasses of milk per day also showed increased risk as did those drinking four or more glasses per day. The increased risk associated with low milk intake is consistent with studies showing reduced blood pressure with increased calcium intake. The increased risk with high milk intake has not been demonstrated previously.
5. We studied the effect of a low-salt diet (less than 5g/day) on pregnancy-induced hypertension compared to patients with hypertension due to chronic renal failure and essential hypertension. These results indicate that a low-salt diet is not only ineffective, but also accelerates volume depletion in preeclampsia.
6. Studies at "the Farm," a community of spiritually gathered young people in Summertown, Tenn, have shown that it is possible to sustain a normal pregnancy on a vegan diet. The source of dietary protein (ie, animal or vegetable) does not seem to affect birth weight, as long as vegans are health conscious, receive continuous prenatal care, supplement their diets with prenatal vitamins, calcium, and iron, and apply protein- complementing nutritional principles. Preeclampsia may be caused by a relative prostacyclin deficiency in the face of excessive production of thromboxane A2. A vegan diet (one low in arachidonic acid) might provide protection against this condition, especially if the conversion of linoleic acid to arachidonic acid is inhibited by decreased activity of the enzyme delta-6-desaturase. We examined the maternity care records of 775 vegan mothers for symptoms of preeclampsia, and only one case met the clinical criteria. Since preeclampsia in our culture is frequently associated with unrestrained consumption of "fast foods" (foods having high levels of saturated fat) and rapid weight gain, it is possible that a vegan diet could alleviate most, if not all, of the signs and symptoms of preeclampsia.