1. Problem with fad diets - they're not sustainable
You just can't stick to them in the long term. And if you can't do that, they are never going to lead to a permanent solution to weight loss.
If you've got cravings, they've either come cutting out whole food groups, or cutting your calories too low.
You see, your body needs a certain amount of calories to function. Similar to a car. You need to put fuel into your car, if you don't put enough in, your car won't function properly.
So if you've cut your calories, your body will start to scream for food. And that's cravings.
You generally crave sugar when you're hungry because sugar provides a quick hit of energy.
And if you're anything like me, once you give in to your cravings, well that's it for the day, at least.
'I'll start again tomorrow, or Monday'.
This doesn't mean you're a failure. You're not weak willed, or not dedicated enough. It's very unlikely that anyone would be able to stick to a restrictive diet for the long term.
So whether it's due to cravings, hunger, cost or you just can't eat cabbage soup any longer. Fad diets are not sustainable.