Aamir Khan says putting on weight and losing it so fast is very unhealthy.

Superstar Aamir Khan, who went through a body transformation for his forthcoming film Dangal, says it was one of the most dramatic ones in his career.

"Though I went through body building to get a certain look for my film, this (Dangal) one was one of the most dramatic body transformations so far. The film has two phases. For one part, I had to put on weight. So, I weighed 96 kgs with 38 per cent body fat and that I had to reduce to 9 per cent body fat within five months. That was a huge task," Aamir said here.

He added: "I would like to mention that putting on weight and losing it so fast is very unhealthy. I did it for my film under the supervision of experts, but it is very unhealthy for any regular person."

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However, he said that his doctor suggested not to try such drastic weight and body transformation in future. But being a creative person, he tends to get "excited to do everything if I get a good script".

What made him put on so much weight instead of using bodysuit for his character?

He said: "When you put on weight, it affects your breathing and body language. That naturally reflects on your performance. You cannot get that from a bodysuit." But he had a gala time while putting on weight.

"I ate everything that I was not supposed to eat otherwise. I had samosa, vada pav, chocolate, cakes, brownies... I indulged in everything. Then when I had to lose the weight, I had a very different diet of 25 gms of upma and papaya. After gym, a glass of protein shake," said Aamir.

Aamir will be seen as Mahavir Singh Phogat, father of wrestler Geeta Phogat, who won India`s first ever gold medal in wrestling at the Commonwealth Games in 2010.

The biopic, directed by Nitesh Tiwari, is set to release on December 23.