The Heart Foundation is under fire again over the alleged mis-use of its red tick system which gives the seal of approval to healthy foods.

One fruit snack bar for kids, Nestle’s "Fruit Fix" actually contains about 75% sugar, but received the Heat Foundations tick anyway.

This has prompted a heated debate about misleading labeling and whether natural sugars from fruit are any different to ordinary white sugar.

David Gillespie is the author of a new book on the effects of sugar consumption called "Sweet poison".

He's attacked both Nestle and the Heart Foundation saying they are promoting unhealthy products.

He spoke to 2ser’s Alex Angel.