According to research done by Prof Hostettmann in Switzerland, with Indian and Chinese universities- there is one very simple, cheap and easily available natural 'drug' that can seriously help with prevention, and also with delaying progression- Curcuma or Turmeric. It is a strong anti-inflammatory which is very helpful with joint pain- but also has an effect on inflammation of other tissues and the brain- with a positive effect on some cancers, and Alzheimers.
But drug companies don't really want to do research on cheap, easily available compounds - as there is no great profit.
It is more effective in concentrated liquid form- so we take 1 of Curcumin extract, and 1 of turmeric everyday. The Curcumin is quite expensive, but there are no side effects- so for us, really worth the money.