I used the shakes after the first week of induction and while they taste great, I found that I started feeling very fatigued and worn out much of the time. The shakes do contain maltodextrin, which is a sugar that some say doesn't have any impact on blood sugar, but I've read in various places that it can indeed make an impact. Maybe it just depends on the person. I haven't had a shake in a few days and can tell a real difference, but I can't say for sure that they were the cause of my fatigue. My guess is that with some people, any amount of sugar can cause adverse reactions - including stalls.