The healthy food choices on offer at supermarkets might not be as healthy as we like to think.

Consumer New Zealand is calling for better food labelling, after finding a lot of so-called low-fat healthy foods are high in sugar.

One 99% fat-free cereal also happens to be one quarter sugar....while a product labelled as a 99% fat-free sweet is half sugar.

Researchers are also highlighting a gluten-free cereal, styled as a health food, which contains 30% sugar.