“Nobody disputes she’s done brilliantly to lose this weight, but now it’s getting obsessive,” an insider told Radar Online.
“If she left it as she is now that would be fine, but she’s talking about losing a bunch more and really pushing herself to get the body of an athlete.”
And their concerns don't stop there, as her friends fear she is pushing herself too hard.
“She’s eating bird-sized portions and working out non-stop in the gym – often up to three times a day!
“Fitness has turned into a real OCD obsession, but she can’t seem to do moderation at all,” said the insider.
Adele seems oblivious to their concerns, and has been enjoying her new single life.
After Drake's party, the mother-of-one took to Instagram to pay tribute to her friend, who she called "one of the kindest and funniest" people she'd met.
She also cryptically addressed her weight loss by saying: "I used to cry but now I sweat".
The star recently split from her 45-year-old husband after eight years together. The pair share seven-year-old son Angelo.
She has since been linked to Grime artist Skepta.