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This is an extremely unhealthy rate of weight loss. All guidance centers around .5-1kg/week as both safe and sustainable.

Not if you start from an extremely obese starting point like I did. I don’t recommend this rate to people with normal weight.

This is also wrong. It’s extremely unhealthy, unsafe and unsustainable to lose 15% of your body weight in 2 months.

Not wrong in my personal case - I've lost those 20+ kilograms with no problem to report.

Again, it was not a calorie restriction diet - it was a carb restriction diet.