Experts agree that in the vast majority of cases, Alzheimer's, like other common chronic conditions, probably develops as a result of complex interactions among multiple factors, including age, genetics, environment, lifestyle, and coexisting medical conditions.
Yogurt is a dairy product made by fermenting milk using one or more of a variety of particular bacteria such as Lactobacillus acidophilus, Lactobacillus rhamnosus, Lactobacillus bulgaricus, Enterococcus faecium, Streptococcus thermophilus, and others.
Yogurt made with frozen starter vs. yogurt made with fresh starter. I tried it several times and absolutely could not tell the difference between yogurt made using my own 3-day-old homemade yogurt as starter and that made with my homemade yogurt stored in the freezer for 3 months.