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WARNING!
There is a statement someone posted on Earth Clinic that soy milk may help Alzheimer's, or help prevent it, is untrue, and could be terribly damaging if people follow it. There is very overwhelming evidence that eating unfermented soy, such as soy protein or tofu, can help TRIGGER Alzheimers, not prevent it! The recommendation to drink it "in case it may help" is sheer nonsense, and sheer suicide for those trying to avoid getting Alzheimers!
Two foods that appear to help PREVENT Alzheimers are coconut oil (unhydrogenated) and Turmeric (the spice)