Eat your way to healthier DNA


18 February 2014

We’ve all heard the age-old saying, “you are what you eat”. But is there really any evidence behind this?

It turns out there is.

Dr Nathan O’Callaghan and his team of nutritional experts from our Food, Health and Life Sciences group is helping to reduce our risk of developing chronic diseases like diabetes and obesity through the food we eat.

Nutritional expert and devoted family man, Nathan O'Callaghan and his two little monsters.

Nutritional expert and devoted family man, Nathan O’Callaghan and his two little monsters.

After studying genetics at the University of Adelaide and the Australian National University, Nathan joined us as a post-doctoral fellow in nutritional genomics. Today he leads our team of obesity and metabolic health experts, helping Aussies manage and avoid obesity and its related health effects.

In particular, Nathan is looking at how food and food components interact with our cells, tissues and organs to impact our health.

“The information we can collect is quite amazing – from exquisite details of molecules sitting on top of our DNA, to what the entire Australian population is eating! The challenge is to use what we know to help people optimise their health,” says Nathan.

He is measuring the amounts of particular molecules in people’s bodies to create a ‘picture’ of the way they are functioning. This can help experts determine how certain foods, diets and lifestyle programs might influence our wellbeing. They can do this through a blood test, saliva sample, urine sample and now even a breath test.

An example of DNA damage within a live cell. Image: Glyn Nelson.

An example of DNA damage within a live cell. Image: Glyn Nelson.

The data he collects can also tell us which types of nutrients can help improve our health. In fact, research shows that changing your eating patterns can affect your DNA or genome in just two weeks.

So this raises the question, how can we eat our way to healthier DNA?

Nathan suggests eating a diet high in fibre, fruits and vegetables, with some fish and vitamins can improve our genome and cellular health. Oily fish like salmon and tuna contain high levels of omega 3 fats which can help prevent heart disease.

On the other hand, eating too much processed meat and drinking too much alcohol can actually damage your DNA, age your cells and increase your risk of serious diseases like bowel cancer.

Two children in the snow

Nathan’s adorable little snow bunnies, Tilly (left) and Alfie (right).

But it’s not all genes and cells for Nathan. Back in 2011 he was a contestant in the very first series of I’m a scientist, get me out of here – an online Australian Idol-style science contest where students vote for the scientists they find the most interesting. Nathan proved to be one of Australia’s most popular scientists, with the highest-ranking overall score for South Australia.

“It was great to be part of the program. I want to inspire the next generation of scientists and give students who are studying science the opportunity to see what we do and how we do it.”

He’s also a devoted family man and loves to travel with his two kids, Tilly (age 7) and Alfie (age 3). He even took them on a recent work trip to Canada where he was investigating how nutrition during pregnancy affects health trajectory in babies. Now that’s multitasking.

Nathan tweets as @nath_oc.

For more information on careers at CSIRO, follow us on LinkedIn.