Genetic variation may are likely involved, as could exposure to nerve-damaging substances in the environment, or both. ‘Race most likely acts as a proxy for differential environmental exposures and lifestyle experiences, which may interact with biological variations,’ the authors note. Certain medications, chronic or recurrent nasal disease or contact with various volatile chemicals could harm olfactory function. ‘Sanitation workers, for instance, are often affected,’ Pinto said. ‘They are routinely exposed to noxious odors that may trigger irritation.’ Presbyosmia can possess a substantial effect on wellbeing, the researchers emphasize.That's very good news, because this is often who the government is wanting to reach with this information, Ellison said. However, labels of any form – so long as they are relatively easy to understand – are likely to have the largest effect on less health-conscious diners as the information is new to these individuals. For the health-conscious extremely, adding the traffic light symbol to the existing calorie information further reduced the number of calories ordered. Calorie counts did provide the most health-conscious with additional information, but it was the symbol that enhanced the info provided to these consumers really, she said.