Milk prevents Oxidative stress, which is known to be associated with many diseases including Alzheimer's, Parkinson's and other conditions.

Researchers said, "This is important because glutathione could help stave off oxidative stress and the resulting damage caused by reactive chemical compounds produced during the normal metabolic process in the brain. Oxidative stress is known to be associated with a number of different diseases and conditions, including Alzheimer’s disease, Parkinson’s disease and many other conditions."
In-Young Choi said, "Antioxidants were a built-in defense system for body to fight against this damage and the levels of antioxidants in brain could be regulated by various factors such as diseases and lifestyle choices. Our equipment enabled us to understand complex processes occurring that were related to health and disease and the advanced magnetic resonance technology allowed us to be in a unique position to get the best pictures of what was going on in the brain."
The study appears in the American Journal of Clinical Nutrition.
Source-Medindia