Ugh, my heart hurts. Onions are my least fav vegie.
As a hobby I love learning and researching various things. Among my various readings, I've learned the following things about alzheimers. Hopefully, some of the info might help someone else.
1) Theory that sleeping on your side the majority of the night helps to prevent it. This is because the brain changes function differently while sleeping and does some kind of "cleaning itself" when we sleep on our side. (from a TED lecture on Youtube) The study discussed in the video showed a large percentage of people that slept on their side for years had much less incidences of alzheimers.
2) Chronic dehydration might encourage alzheimers. This is because there is a fluid space between the brain cells, and the synaptic electrical signals from one neuron to the other needs that fluid to communicate between them. So drinking water is vital not just for everything else our body needs to do, but also to keep our brains healthy. Be wary of beverages that act as a diuretic, such as anything with caffeine, certain teas,or alcohol. Diuretics trigger your body to release water from your system.
3) Physical and mental (memory) exercise helps prevent or improve the condition.
Whether or not any or all of these are true, I don't know. But they make sense and should be helpful overall.