In theory, most of us know the things we should and shouldn't eat. But sometimes it can be hard to distinguish between good and bad foods or even if we can, it's hard to stick to better eating habits.
So where do we start in knowing what to buy at the supermarket and what to eat more - or less - of?
Get your head in the game:
"Rather than thinking of foods as good and bad, we look at foods as everyday foods and sometimes foods," says Simone Allen, advanced sports dietitian and accredited practicing dietitian at Nutrition Works."If you start thinking of foods as bad, it starts off a whole set of negative thinking processes."
Focus on what you want out of your food:
Be serious - and a little bit fussy - about eating, say the dietitians.
"Look at what you want to get out of your food," Ms Allen says.
"Rather than looking at whether it is low kilojoule or low fat, look at whether it has fibre to help fill you up or a good amount of calcium to keep your bones strong."
Jan Purser, naturopathic nutritionist at Food Body and Health, suggests focusing on eating at least three cups of vegetables each day (raw or cooked). She says focusing on this, plus protein, throughout the day will help satisfy your hunger and "squeeze out" the unhealthy foods.
"If you think too much about food you shouldn't have you just want more of it," she says.
Curb the afternoon cravings:
"I find that if people have some protein at breakfast and good protein at lunch, they have far less cravings at afternoon tea time," Ms Purser says.
So what's a good protein option? Ms Purser recommends protein smoothies with fruit, eggs on grainy toast or untoasted muesli with nuts, seeds and yoghurt for breakfast.If you are craving an afternoon snack, Ms Allen suggests substituting afternoon biscuits for a slice of raisin bread or fruit and chia bread, fruit, yoghurt or roasted chickpeas.
Find your weak point:
Ms Allen says finding two or three things to be improved that clients do on a regular basis (more than three times a week) is one of the most effective ways to change eating habits.
"Find ways to change those things and replace them with things that you like," she says.
Don't forget the basics:
Ms Purser says eating unprocessed food and avoiding sugary foods is the simplest way to make changes.
Lindsay Peacock, accredited practicing dietitian from the Perth Diet Clinic, recommends swapping processed foods such as cake and biscuits with fresh fruit and yoghurt."Generally speaking, processed and packaged foods are far less nutritious than wholefoods," she says.
Keep it interesting:
Ms Allen suggests including three food groups in every meal, as well as aiming for 20-30 different foods a day.
"This way, you get a better intake of different nutrients and more variety in your foods - it also helps keep it interesting so you're more likely to keep going with it," she says.
Cut the caffeine:
"People tend to make the mistake of having too much caffeine," Ms Purser says. "Too much caffeine makes you more tired and you're going to crave sugar and more caffeine to give yourself a pick-up."She recommends no more than two caffeinated drinks a day.