India has long been considered a country struggling to feed its poorest people, but the country now faces a second nutrition crisis: its wealthy kids are getting fat.

In a program to be aired by the ABC's Four Corners tonight, reporter Anita Rani visits a number of Indian middle-class families whose children have hit the 100 kilogram mark and beyond.

Millions of Indian are now morbidly obese, with one in three Indians in urban areas classified as overweight.

The boom in fast food availability and a middle-class obsession with Western culture is accelerating the problem for India's younger generation.

A lack of health education means many young Indians do not believe there is a problem.

Twenty-year-old Adit Shetty weighs 126 kilograms but says he is OK with his size.

"I'm concerned about my health but I don't think... something [is having an] adverse effect as such, I think I'm good at the moment," he said.

One of the challenges facing India's youth is the dramatic lifestyle changes that have come about since previous generations were children.

In the past, chubby children were considered healthy, as a sign of a family's wealth and ability to provide for their children.

Families turn to surgery solutions

But technology and the new-found wealth of many middle-class families has meant children are less active and have more access to cheap fast food than ever before.

It is estimated that a third of pupils in some private schools are obese.

The problem is exacerbated because the Indian population is also genetically predisposed to suffer from diabetes.

Twenty-year-old Adit Shetty says he is not concerned about his weight. ( BBC )

India has the largest diabetes population in the world, with more than 50 million sufferers.

Surgeon Shashank Shah says obesity is to blame.

"India is now a global hub of diabetes, and its purely because of obesity," he said.

Some families are now turning to surgical means to keep the children's weight under control.

Dr Shah performs weight loss surgery at his clinic in Pune.

He says he performs at least 10 weight loss procedures per day, and an increasing number of his patients are under the age of 25.

"Roughly when I started 10 years back we hardly had one adolescent come in," he said.

"But in the last five years, now probably 25 per cent of the clinic is becoming a clinic for adolescent obesity."

Watch the full report, Supersizing India's Kids, on Four Corners at 8.30pm Monday night on ABC 1.