Its not too far from being like the vdiet, just much more extreme tbh.
Its completely removed from being the vdiet. Firstly 14grams of fat is terrible, the brain is largely fat, you will feel like crap without eating any fat.
One of the key things with ketogenic diets is its muscle sparing, keeps you in fat burning mode 24-7 without burning muscle when you switch between carbs and fat. Not losing muscle is the key to long term weight loss and at 500calories a day a large portion of the weight loss will be muscle. Which will do two things, once off the diet your resting metabolic rate will be far lower than before, meaning if you slip back into the old way of eating you'll be eating same calories with your body burning far far less, thats what leads to most people gaining weight as soon as they are off a diet.
Dropping past the 1k calorie limit is also where body slips into starvation mode, when your body will do everything to keep fat and will eat muscle first.
I mean, good luck to you, often when having a much higher body fat percentage you will lose fat easier than if you have a BF% of say 15%. An extreme diet to get you going isn't necessarily bad and I totally agree that it certainly can't be worse than staying at such an unhealthy weight. But the problem is you could be setting yourself up for a fall and thats certainly worth remembering. Almost any diet, low carb, low fat, low calorie, low food, low something else... you tend to drop total food intake so even a low fat diet has lower carbs than you'd usually eat. This is where the insane first week drops tend to come from, water weight, every gram of carb stored stores 4grams of water with it. As your carb stores deplete, which they do on any diet really, you will and do lose a lot of weight very quickly.
Its incredibly frustrating for anyone losing weight to lose4-6lbs a week for 2 weeks, then watch the weight loss slow down to 0.5-3lbs a week. The way to deal and cope with it is this, know it will happen, expect it to happen and don't be suprised. Its probably(complete guess but probably right) the number one cause for people dropping diets.
The biggest issue I see is you won't lose 7 stone in a month, you need a decent diet to run through for the entire course of your weight loss and theres little reason to go extreme then switch to something less extreme. THe muscle loss you'll experience in the extreme month will slow down progress in subsequent months, which is why the extreme/fad diets tend to fail long term.
So far i'm just over 3 months into a keto diet with the odd carb up day, I've lost around 3-3.5stone at the moment and its been a slow month for various reasons. Going to be another bad month, having simple surgery on my toes(2) tomorrow morning for ingrown toenails, which will be a bit of a pain in the behind for the next few weeks
