If your daily diet includes orange juice, a dash of coconut oil and a typical muesli bar, don't expect a tick of approval from a nutritionist.

A survey of more than 1000 adults and more than 130 nutrition experts shows there's a surprisingly big gap between what the public and nutrition experts believe is healthy.

"Products like coconut oil, gluten-free cakes, orange juice, muesli bars and frozen yoghurt, which are heavily marketed as good for us, were seen as healthy by a much higher proportion of the public than nutritionists surveyed," said Alison McAleese of Cancer Council, and Heart Foundation Victoria's Livelighter campaign.

A whopping 75 per cent of respondents rated coconut oil – the ingredient du jour – as "healthy" while 85 per cent of nutritionists disagreed.