Although Sian Williams acknowledges she's "living with uncertainty" since her battle with breast cancer two years ago, the experience has, she reveals, given her a new and more liberated perspective.

The former host of BBC Breakfast for 11 years, was diagnosed a week after her 50th birthday in 2014 and underwent a double mastectomy.

Living with uncertainty

"One of the brilliant doctors who treated me told me at the end of it all, 'You've got to live with uncertainty because there's no clear-cut path ahead,'" she explains.

"But knowing that actually made it a lot easier, because after all, we're all living with uncertainty as no one ever knows what's around the corner.

“That doctor also told me, 'You're lucky, you've got a full and healthy life, just go out, enjoy it and live it.' In the early days, I did have anxious moments thinking, 'Maybe it's back', but then you just get on with things like work and the family and realise there's no point constantly worrying."

The 52-year-old mother-of-four, who has two adult sons from a previous marriage as well as a son, Seth, 10, and daughter, Eve, seven, with her TV producer husband Paul Woolwich, has previously revealed that her biggest fear following her diagnosis was not being able to see her youngest children grow up.

"Nowadays I just feel very blessed and so fortunate that my cancer was very treatable. I'm in robust good health and all my check-ups, which I will continue to have for years, have been clear," says this down-to-earth woman who acknowledges, "it's taken work and been an effort", but she's now able to feel "very positive" about the future.

[Read more: 12 ways to feel fighting fit at 50]

Making health a priority

Health is currently a work focus too as she's been investigating the vast array of health products available on the high street with co-host Dr Ranj Singh on ITV series Save Money: Good Health.

"We spend so much money as a nation on over-the-counter remedies and supplements, because often we're looking for a quick health fix or may be reluctant to go to a doctor.

“It's about helping viewers decide if they're spending their money wisely and exploring any cheaper alternatives," says Williams, who was born in London to Welsh parents.

Her personal health battle, which she kept secret until May 2016, has made her re-focus her own approach to health and dieting. "We should all stop persecuting ourselves about what we eat. 'Diet' is a word which reeks of a punishment regime where pleasure doesn't get a look in, and that can't be good for us," she declares.

"I watched my mum on diets while I was growing up and although I'd sworn never to diet myself over the years, I started excluding quite a lot of food groups in the belief it would make me healthier.

“I've tried fasting, cutting out sugar, gluten, and paid attention to reports about wine or certain foods which have been said to raise our cancer risk. So I've been all about drinking green tea, eating salmon and running."

[Read more: Why yo-yo dieting is bad for you and 7 tips for healthy weight loss]

Being kind to your body

The presenter, who anchors 5 News on Channel Five and who lost her mother and her aunt to cancer, reflects: "It's ironic that my husband's never done any of that, and has been known to have things like a couple of doughnuts for breakfast, but I'm the one who got the cancer! Recently I've found out that it's a varied diet which keeps you healthy and if you cut out too many food groups, your gut simply doesn't like it.

"The gut's called the 'second brain' because it has such a direct influence on the way we feel and think and I'm researching foods which can give us a happy gut and healthy mind."

Nowadays she avoids imposing 'healthy' rules on herself and says: "I'm kinder to myself. I've had enough of the 'shoulds' and 'should nots' which used to define what I did and instead this year my approach is: 'I might do this or that', which I regard as far better. I've realised if you break the rules you've set yourself, the result is you feel you failed, and who needs that?"

Focus on family

The last few years have, she says, inevitably changed the way she looks at life. "You become very aware of how important the people you love are to you after [illness]... and how important it is to spend time with them," says Williams.

"I focus on looking after the family, having a happy home, and showing compassion to other people. It's about being more aware of when people need a bit more help and, hopefully, being the one who can offer it. That's become much more important to me, and my philosophy is: concentrate on the big stuff and let the small stuff go by the way."

Ageing is of little consequence to her, she says with a smile, because "my fifties have been fab for me so far and I just feel everything's all good at the moment.

“I have two mantras which are: 'Be mindful, be grateful, be kind' and one from the wonderful Winnie-the-Pooh books: 'You're braver than you believe, stronger than you seem and smarter than you think'.

“I'm healthy, I've got amazing children, and, after renting for two years, we've just moved and are making a new home in Kent, a project we've dreamt of tackling. Life couldn't be better."