Mariah Carey’s Secret Weight-Loss Surgery

Mariah Carey stepped onto the New Year's Rockin' Eve stage Dec. 31 (left) as much as 40-pounds slimmer than last year's Times Square fiasco (right) — thanks to gastric-sleeve surgery in October —  but one expert is convinced the songbird will blimp up again!

“Any surgical solution for weight loss is just a shortcut with a poor chance of long-term success,” declared diet and weight-loss expert Dr. Stuart Fischer. The troubled “Hero” diva hit a scale-busting 200-plus pounds just months ago — and her blubber was hard to hide on stage, inspiring torrents of online criticism.

“Mariah has always been proud of her curves, but this summer, as her Caesars Palace residency came to a close, and she went on tour with Lionel Richie, she noticed it became harder to dance and she was getting a lot more criticism online from body-shamers,” dished a source.

After that, Mariah wasted no time turning to surgery. She’s now flashing a foxier figure (left), and insiders said she’s looking to lose more weight! But Dr. Fischer believes Mariah — who shed 70 pounds after giving birth to twins in 2011 — has courted massive health problems with her yo-yo dieting and quick fixes.

“Taking the weight off again — after piling on the pounds the way she has — will not erase the damage she’s already done,” he warned. “Her weight gain put her at risk for 65 potential life-threatening illnesses, including diabetes, sudden cardiac arrest, along with breast, uterine and cervical cancers!”