That is somewhat true, as the fructose spikes insulin, the cells readily store fat. However, I do not believe that this is the same case with consuming dietary fat. The opposite is true, Insulin regulates fat metabolism, it is like a switch. When you consume carbohydrates, insulin increases a certain amount depending on the GI and Glycemic load of the carb. Then a certain amount energy is used from the carbohydrate, when there is excess enery, the energy is stored as fat and glycogen, then later on when we havent eaten for a while, the stored energy is used in the form fat, and in the form of glycogen through anerobic bursts. Without insulin we could not store fat because it is literally the regulator of fat. So the low fat theorists actually have their information reversed, but I digress. When I said that cancer needs sugar to grow, I literally meant it, modern science has ignored a mid 1900 researcher (which I still need to find again and tell you guys) who won a nobel prize for figuring out that without sugar in the body cancer cannot manifest. This is because cancer grows only in an anerobic (without oxygen) environment. In an oxygen environment cancer cells die. It just so happens that glycogen is very anerobic, so it is used in the production of cancer.
As for the training the body to get it's glucose from proteins, I dont see anything wrong with that and never did. And its not "training" the body per say, its just another way to get glucose. Theories out there about ketoacidosis, harmful effects of ketones, and muscle wasting have only been made on whole cloth through speculation. part of the muscle wasting theory holds true and part doesnt. Heres why: picture I consume only 50g of protein today and no carbs, well hell Im gonna need some glucose so my body uses that consumed protein and since not enough glucose can come from 50g of protein, my body pulls from my protein stores and muscle wasting occurs. This is what all the "smart" nutrition gurus use to convince people to consume more grains and carbs. Here's the other side of the story they dont tell you. Lets say my friend Jonny eats 300g of protein that day. What happens is protein is used for repair, hormonal production and all the other countless uses amino acids are used for. Then since an abundance of protein is eaten, some of it is stored as glycogen through gluconeogenesis and used as glucose for the brain and other parts that need glucose, but it does not spike your insulin so much that he stores huge amounts of fat, yes a little fat can be stored but in a healthier way. Anyway, Jonny was able to build his body with protein and have sufficient energy from glucose without spiking insulin so there is no insulin resistance to build up over time.
On another note: many people visualize our brains just consuming endless amounts of glucose so everyone goes "oh no, if I dont consume enough carbs, my brain wont have any energy and I wont be able to think." This is also one of the most bogus theories around as well. Truth is, science knows and has known for decades that our brains run 2/3 on fat in the form of ketone bodies, and only 1/3 on glucose.
I am sorry for the long write up and hope I didnt bore anyone, but nutrition is my passion and I like to find and tell only the truth. I really hope that helped you understand more about protein, fat, glucose, and insulin Jared Bond. Please ask us any other questions you want on this forum. I know a lot, but there are plenty on this forum who know more than me. I'm still a newbie my self (3 months) on this raw diet but come from a nutrition backround.