BUT.....
My gf has decided to blast it, because she tried a similar keto diet a few years back and actually gained weight. Here is her take on it, and I'd be interested to get your take on it Mark. She actually knows a bit about nutrition (or think she knows
Its like, I know she is talking shite on this one, but I haven't got the expertise to prove it, hence, me posting this.
So help me out here dude!!
Here is her "expert" opinion:
I still think this is total BS.
Here's why: you drain your bloodstream of glycogen (i.e. produced from any form of sugar/carb intake) which is exhausing and makes you grumpy and weak (as Dave very correctly said). This takes 3 days and your body then switches over to burning it's own fat for energy. On a high fat diet the 3 days you're going into ketosis (the process of burning your own fat for energy) you're loading up on fats while your body is still going to it's own bloodstream for energy - thus, you're piling on fat (and perhaps burning a small percentage of it) WHILE you have an unusually low amount of energy and are naturally burning less.
Then, you've got two golden days where you're feeling stronger and your body is in full ketosis burning fat for energy - but you're STILL loading up on fat... so in actual fact, you're burning more of what you're taking in rather than your own. (Keep in mind also that fat has the highest amount of calories per gram - so if you're talking about slimming down, you're talking about a caloric defecit, not a surplus.)
Then comes the worst bit of this - you're dying for carbs by this point, and as you then are 'allowed' to have them, you eat the hell out of some haribos/bread/pasta which spikes the amount of insulin and glycogen in your blood stream. Your body then has a surplus of glycogen, which if unused will go straight to fat (and if you're eating a lot of carbs, it's likely to). You then have the excruciating 3 days of coming down again (which is even worse now because you've probably got a large amount of glycogen to drain from your bloodstream), you're exhausted all over again, you've got another 3 days of high fat intake/low energy, and the whole process repeats.
The only way I can even fathom this working is with a high amount of exercise to burn off the fat you're consuming going into ketosis (potentially unrealistic, because you're feeling weak) and a consistently high amount of exercise the days you're eating carbs, just so you don't have all that glycogen sitting around in your blood stream... which means 5 days a week at the gym. And to be honest, if you're usuing your own fat for energy, the days you're in ketosis you're probably going to want to kick it at the gym to burn off more faster!
So, to that end, I think this is a load of shit and that if you want to lose weight you need to have a high amount of exercise and a low amount of carbs/fat.
Thoughts?

