The Benefits of Fasting
Since the Ketogenic Anti-Cancer Diet mimics starvation then a period of fasting is a great way to start to get yourself into ketosis quickly. As you begin fasting your body will use up whatever free glucose that is in your blood and when that is used up then it will start to use your stored body fat to turn into ketones that body cells can use for fuel but as you have read (hopefully) that cancer cells cannot make the metabolic switch from glucose to ketones. A 48 hour fast is best done on a weekend with your last meal on Friday night then breaking your fast with a light meal (don't go nuts) on Sunday evening. Meanwhile you can drink all the allowed fluids you want including vegan protein shakes as there is very low carbs and maybe 1 gram of sugar in them, or should be.
I was exposed to a flu that was going around while I was on the diet. I really didn't want to eat so I didn't. I fasted for two days and then ate a high protein meal. I never caught the full brunt of the flu and was fine after two days of fasting.
There are other benefits to fasting. In nature, when animals get sick they stop eating and instead focus on resting. This is a primal instinct to reduce stress on their internal system so their body can fight off infection. We humans are the only species who look for food when we are ill, even when we do not need it. Fasting also gives your digestive system a rest. The digestive system consumes a lot of energy. It also gives the body a chance to detoxify as waste is removed. The body is designed to fast; we do it every night. If you eat supper and don't snack on empty carbs then you go to bed and wake up in the morning and have breakfast about 12 hours have passed. And the word "breakfast" makes more sense when you break it down to "break fast" or to break your overnight "fasting."
Our distant ancestors fasted all the time between foraging or if they were lucky, to kill a game animal. We inherited this ability to go stretches of time between eating as sometimes our distant ancestors would have to go several days before they found something to eat. In between times they lived off their stored body fat.
No one really knows where three meals a day comes from but a little research came up with a lot of theories. One theory said that peasants who worked the fields would eat breakfast and then bring food with them to eat when they felt hungry and then they usually ate supper while the sun was still up because preparing and eating a meal by candle or firelight was a pain. When electricity became available then people started to eat supper later as there wasn't an issue with lighting.
Personally I eat two meals a day. I am retired (lucky me) so I eat brunch and then eat supper whenever I feel hungry. My breakfast is high protein that takes longer to digest than the usual high carb breakfasts most people eat. I also drink a protein shake in the morning which adds to my protein intake.
I have heard of people fasting for a week or maybe even two but personally I would not suggest this. Your body is receiving no nourishment or essential nutrients during a long fast. If you do decide to fast for two days to kick yourself into ketosis quickly be sure to drink protein shakes and allowed fluids. Fast during a weekend as you can rest while fasting and if you are in a labour intensive job then fasting during working days is not a great idea as you need energy to do your job. If you fast during working days you will probably experience problems such as light headedness, fatigue and lack of energy because your body wants to rest to conserve energy as other mammals in the animal kingdom (that we are part of) do when food is not available or they are injured and their natural instict is to rest to allow the body to conserve energy and direct it towards healing.