I covered that in a few posts I did before the start of the diet, linked below. TL;DR is that there is evidence for the reducing cancer risk benefits in cellular models and rodent models. There is evidence for it also in some shorter studies that looked at effects on improved chemotherapy results and some reduction of IGF-1 in healthy people. How that translates into life long cancer risk reduction is far more speculative, especially if you are pairing it with diet and lifestyle that already puts you in a state with good IGF-1, blood sugar, lipid, etc. levels. As for the weight loss I've documented, most of this is incredibly temporary. I'll be going into it in my post-fast summary post once I have the data but the actual body weight, mostly fat probably, loss will be 2-3 pounds not the 13 pounds that I've measured over the fast. That is substantially water weight and "less material in the digestive system" loss that will return over the next few days. I've done these a few times and these shorter fasts have been pretty much the same for me, which I documented in the first post.