Originally Posted by
Rotted
Exactly this.
These diets work and don't work at the same time. Simplified explanation, when you eat, you get glucose for energy, it also gets converted to glycogen and stored in cells for later use. Carbs are generally great towards this. You get complex carbs which releases energy slowly through out your day and you get simple carbs which are quick bursts of energy.
When you exercise, as a rule of thumb, you use glucose up first, then your glycogen store, then your body starts to metabolise the fat you have stored (left over from taking in to much food, like carbs and sugars. Again, as a general rule this takes on average 45 minutes to deplete all your stores and begin to access the fat. Post exercise you eat, you restore the stores ready for next time. This is why weight loss takes time. Eat, store, exercise, replenish,
When you're doing a diet like this, you're essentially 'bypassing' the storage parts. You're constantly using the fat or accessing the fat very quickly for you're day to day function, not because you're being physical or doing exercise (on avg, course some people will be).
The problem you can have doing this, is using you're fat storage quickly and losing it, then giving up your diet is the body will go 'Oh shit food, need to replenish those stores!', which results in you putting the weight back on. Except because it's the bodies reaction (think of like, the body thinking oh shit I don't know when I'll get fed like this again), it'll store the food as fat quicker and more of it. Meaning you'll gain more weight at the end.
I've seen friends and family use this diet and ones similar to it, they all have great results then a few years down the line they have the occasional nice meal here or there, then another and before you know it they are back to their former size and bigger.
If you're sure you can do the diet indefinitely, then go for it just remember at that point you're not on a diet you're on a complete life style change.