Consuming milk can be a great source of calcium, potassium, and magnesium. Milk and other dairy products can help protect against bone disorders. The health concerns of not consuming dairy in some vegetarian diets is the lack of a strong and mechanistic bone support system. So vegans have reduced bone mineral density, increased chances of bone fractures, and other health risks compared with lactovegetarians and omnivores. (Weaver) Approximately 1300 mg of calcium is recommended daily for adults.
Where does soymilk come from? Soymilk is made by soaking whole soy beans into water and then squeezed to produce a milky liquid for consumption. Concerns of consuming soymilk are getting allergies, cancer, and the negative effects of higher estrogen levels. However, those concerns are debunked when you look for peer-reviewed sources and not speculations or assumptions. "We conclude that the phytoestrogen dose consumed had no effect on semen quality." (Mitchell)
Even soy infant formulas are found to be harmless and safe.
"Soy infant formulas do not adversely affect human growth, development, or reproduction." (Merritt)
Safety of Soy-Based Infant Formulas Containing Isoflavones: The Clinical Evidence1
Effect of a phytoestrogen food supplement on reproductive health in normal males
Julie H. MITCHELL*, Elizabeth CAWOOD†, David KINNIBURGH†, Anne PROVAN*, Andrew R. COLLINS* and D. Stewart IRVINE†
"We conclude that the phytoestrogen dose consumed had no effect on semen quality."- - -
Should dairy be recommended as part of a healthy vegetarian diet?
By
Connie M Weaver
"A benefit-risk evaluation of the evidence for including dairy foods in the diet is presented. For many persons dairy products provide a substantial portion of essential nutrients, but especially calcium, potassium, and magnesium. Dietary supplements and fortified foods can be alternative sources of these nutrients, although other components of dairy foods such as amino acid composition and conjugated linoleic acid may be instrumental in the benefits associated with dairy product consumption for bone health and reduced risk of stroke, metabolic syndrome, and some cancers. Newer evidence shows that protein-induced calciuria does not have a detrimental effect on net calcium retention, and the concentrations of hormones in milk are not outside of the range of endogenous concentrations. Increased dietary protein, including from milk, can elevate serum concentrations of insulin-like growth factor I, which has an unknown relation to cancer. The concern over consumption of milk leading to increased risk of prostate cancer through reduction of serum 1,25-dihydroxyvitamin D, a potent anti-prostate cancer hormone, has been resolved with new evidence that local production of this hormone is independent of diet. Overall, evidence suggests that being a lactovegetarian has greater health benefits and reduced health risks than being a vegan."
Reference:
http://ajcn.nutrition.org/content/89/5/1634S.full.pdf+html
http://www.fitday.com/fitness-articles/nutrition/healthy-eating/soy-milk-vs-regular-milk-which-is-healthier.html#b
http://www.clinsci.org/cs/100/0613/cs1000613.htm
http://jn.nutrition.org/content/134/5/1220S.long
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