I was having my blood sugar creep way up, so I did the 5 day fasting mimicking diet based on the research out of Southern California and it completely reset my blood sugar for many months. Back then I was able to buy a kit based on the research on Amazon for ~$100. After a couple of years, my sugar was creeping up again so I decided to go again, but the University that funded all the research has spun it off into a company that patented everything and private nutritionists are no longer able to sell the kits. I found a coupon on line and am having a go again, but this time one 5-day fast each month for three months. I am going for the full metabolic reset. I am on month 2. The logic of it all makes perfect sense and the research is being proven valid. So far I like the results but I will see for sure in a couple of more months.