Maybe we should follow the European Nutrition Labelling.
Health claims are statements about the beneficial effect on the body of a food, or its ingredients. When you see statements on food labels such as, 'helps maintain a healthy heart', or 'helps aid digestion', these are examples of health claims. General claims about benefits to overall good health, such as 'healthy' or 'good for you', will in future only be allowed to be used if accompanied by an appropriate and approved claim. This means that more general claims will be backed up by an explanation as to why the food is 'healthy' or what makes it a 'superfood'.
Finally labels are not allowed to claim that food can treat, prevent or cure any disease or medical condition. l