How is it legal to advertise something as healthy, when it is almost half sugar?

I saw a product advertised on TV the other day, a so called healthy cereal bar. They looked good, so next time I went to the store I kept an eye out for them.

I found the product in my supermarket, and had a look at the ingredients.

The product in mention, is advertised as having 8 grams of sugar. This would lead you to think, that the bars have 1 gram of sugar each, as there are 8 bars in a box.

After further reading the deceptive box and the small print, you come to realize that it is actually 8 grams of sugar per bar, and that each bar is 20 grams total. Almost half of the entire bar is processed sugar.

This product is advertised on TV, by a nice lady with family-values-style images and bleached teeth.

The commercial and box, both give health advice, such as: Eat well, exercise, and eat their bar for a healthy life.

How does a small brick of sugar end up on a shelf, advertised as healthy, with green traffic light logos next to the ingredients, all indicating how healthy the ingredients are.

I thought there were supposed to be groups of stuffy PC people who are in charge of stopping stuff like that from happening.

How does something like this happen? and what can be done about it.