Sophie, on the other hand, lost even more, shedding 9lbs.
However, the programme added expert generally don't advise crash diets and results can be varied.
Also on the programme, the Summer Sandwich Diet saw one woman lose almost a stone in 6 weeks on How to Lose Weight Well.
Adele's weight loss has wowed fans, with the singer achieving an amazing seven stone weight loss, which she showed of in an Instagram post this week.
The snap was a tribute to Beyonce, in which Adele looked lithe wearing a top by Marine Serre.
Alongside the image of the smiling, fresh-faced singer is a caption reading: Thank you Queen for always making us all feel so loved through your art."