Haven't RTFT but almost six stone in 5 months is way too much weight loss for that amount of time. It will all go back on, so no need to be jealous.
I have seen many people lose 4-6 stone in 4-6 months and be incredibly smug about it. One person I know kept sighing at how HUGE their size 18-20 shorts were now, and kept pulling their belt in, saying 'I am up to the 6th notch now, I was on the 2nd. I will have to get another notch put in it soon' And 'my jeans are massive look!'. BUY SMALLER FUCKING CLOTHES YOU CUNT! is what I was screaming on the inside. Instead, I just smiled sweetly. A year later, this person has regained the 4 stone they lost, plus another stone, Hahahaha LOL. 
This person is one of many I know who have regained all their weight.
Petty and bitchy of me? Maybe. Don't give a fuck .
Don't believe she has just 'eaten healthily' by the way. You wouldn't lose that much that quickly by simply 'eating healthily.' That's bollocks.
I know someone who changed her eating habits to eat more healthy, and cut down her portion sizes by a third, and started going for 3 mile walks (four or five times a week,) and she also started to swim 50 lengths 3 times a week. She lost just over 3 stone (went from 14 stone 3, to 11 and a half stone, and dropped from a size 20 to a size 14,) and it took her EIGHTEEN MONTHS. 5 years later, she is still the same weight and clothes size.
As I said 6 stone in 5 months is a ridiculous weight loss, and it can't be maintained unless you virtually starve yourself.
And people crying 'scorn' or 'jealousy' need to pipe down. People are entitled to their views and opinions. You have no right slagging people off because they have a different opinion to you!