Sara's throwback picture proves how rigorous her weight-loss regime was

Wearing a black dress and posing happily with mother Amrita Singh, this chubby Sara looked completely different from her current glam avatar.

In no time, the post went viral, and was flooded with comments lauding her inspiring body transformation.

However, among the first ones to comment was her Aaj Kal co-star Kartik Aaryan, who wrote, "This girl looks a lot like Sara Ali Khan."

Not only Kartik, but her fans were also surprised to see the picture, and called her an inspiration.

In fact, one of the Instagram users even asked her about the secret behind her transformation.

"So pretty! How much money, time and effort did it take to transform yourself? #askingforafriend," she asked.

Another user commented, "Hats off ma'am to your hard work."

For the uninitiated, Sara had Polycystic Ovarian Disease (PCOD) during her teenage years, which led to her excessive weight gain.

She has spoken about her struggles with PCOD during an interview, and how her condition made it difficult for her to lose weight.

However, Sara overcame every hurdle after she decided to make it big in Bollywood while studying in the US.

"I decided that I really want to act but that realization coincided with the weight scale saying that I'm 96 kilos. So, it was a bit difficult," Sara stated.

Naturally, this transformation wasn't a cakewalk for the Kedarnath actress, as her hormone level was quite high.

But Sara was determined to shed those extra kilos, and changed her eating habits and lifestyle.

Recalling her journey, Sara stated that she shifted her diet from pizza to protein intake, from chocolates to salad.

"So, I lost all the weight that I had gained there and lots more by working out and maintaining a disciplined life," she said.

Reportedly, Sara's fitness regime included Kathak, yoga, pilates, boot camp training, playing lawn tennis with Saif Ali Khan, and intense workouts.

On the work front, Sara has wrapped up the shooting of Imtiaz Ali's Aaj Kal.

The movie happens to be the sequel to 2009 release Love Aaj Kal and will release in February 2020.

Besides, the starlet is working on the much talked-about remake of Govinda and Karisma Kapoor starrer, Coolie No.1.

Helmed by David Dhawan, the movie also stars Varun Dhawan in lead.