Because he had made his home in a workshop in an industrial area, it was likely no one knew he was there.
"We understand he might have suffered a fall and it could have been a while before someone found him. He wasn't doing very well by the time we got to him and had a limited response. I would say he was heading up towards being 400kg or so. He was very, very large."
The man's brother did not want to talk about his condition when approached yesterday, but said he was "not okay" and was "crook as".
The man is believed to be an engineer and to have been living behind the workshop for several years.
One neighbour, who wanted to be known only as Bill, said the man had to customise his car to make the seats big enough.
Another neighbour said he hadn't seen the man since last year. "He tends to keep to himself and is a bit of a recluse.
"He's a very big boy - as well as being large he's also very tall, over six feet.
"He was an engineer a while back but I don't know what he's doing these days," the neighbour said.
"I've heard he's a very clever man and was good at his job."
Lakes District Health Board spokeswoman Sue Wilkie said the man was still in Rotorua Hospital and his family did not want any information about him released, including his condition.
Prescott said firefighters were often asked to help shift obese people to hospital.
Hawke's Bay police said last night they needed Fire Service help to remove the body of a Hastings man from his home yesterday morning.
That man was estimated to weigh 180-200kg.