There is evidence to support programs such as what's called the “red light, green light diet”, where there are red light and green light labels.
If you label food in relatively simple ways, where people can understand what's a healthy food that you can probably eat almost as much as you want of, what's an okay food to eat occasionally, and what's a food that you should only select on rare occasions, that really does help consumers make choices. So that kind of work has been done.