As she approaches her 68th birthday next month, Janet Street-Porter has revealed how she keeps her high blood pressure in check.

As it's hereditary in her case, she keeps her health in check with regular exercise and healthy eating when she's at one of her three homes in London, Kent and Yorkshire.

During the week, she has hot water and lemon, with berries and tomatoes and anchovies on wholemeal bread for breakfast and then treats herself to a fry-up on Saturday and Sunday: "Those rituals are important to me."

"I love my age now," she says. "OK, I can't get into the clothes I wore in my twenties and I don't really care because I wouldn't want to wear them now, as they would be too short. I still play tennis every week, I walk, I swim, I do what I want. I don't feel I have to prove anything."

She swims in the sea at the weekends, without a wet suit in Kent.

"I don't see anyone else there because they are a bunch of wimps!" she says, with a laugh.

"I'm in pretty good shape, but I don't go to the gym any more. I had a lot of equipment in my house and I sold it all. I still have a punchbag - I had a boxing trainer for a year, but I got bored with it. The punchbag is useful when things go wrong at work..."

Considering her success, that can't be that often though.

Janet Street Porter in 1976

Street-Porter left home at 19, married fellow architecture student Tim Street-Porter at 20, and embarked on a career in journalism with a job on a new women's magazine called Petticoat, before joining the Daily Mail in 1969 as Deputy Fashion Editor. She broke into TV as a reporter for LWT in the mid-Seventies - and all the while, she was having the time of her life, drugs and affairs included, as she revealed in her 2006 memoir Fall Out.

"I don't have any regrets about anything in my life, what's done is done... and I don't think there's any point in growing up," she says now. "Being an adult is over-rated. Being sensible? I've never been interested in that!"

So when the producers of I'm A Celebrity... Get Me Out Of Here! came calling in 2004, she didn't think twice, finally leaving the jungle in fourth place, but her hatred of all things conventional also helped boost sales of the Independent on Sunday, when she became its editor in 1999.

Janet Street Porter on Loose Women

She's still their editor-at-large and has weekly columns in the Mail, Independent and on Yahoo, which allow her to vent her spleen, as well as her regular appearances on Loose Women and panel shows like Have I Got News For You. All that, and she's pushing 70.

"If you have the right attitude you don't find ageism," she says. "I've always been a can-do person, and it never occurs to me that I may not be able to do something. Along the way I've made a lot of mistakes, but I just carry on. Some things have worked and some haven't, but on balance, I don't think luck is involved, it's hard work and determination.

"And there's no let-up on what I do as I've got older - and I'm certainly not conventionally attractive," she says, getting into her stride.

"I might be attractive to some people, and I don't think I'm ugly, but I look the way I look, so you have to be well balanced.

"I don't know how I ended up well balanced because I certainly didn't have a good relationship with my mother or my father, but what they did teach me, probably inadvertently, was go out and get it yourself. Don't wait for people to help you, you have to go for it."

Janet Street-Porter is working with BT to launch the BT8500, the UK's first home phone to block up to 100% of nuisance calls. For further information please visit www.bt.com/shop.