FAB RESEARCH COMMENT:
Industrially produced trans fats have no health benefits and many health risks. In fact, the W.H.O declared them to be toxins in 2009, and many developed countries (albeit not yet the UK) are now banning them from the human food supply.
In this observational study, higher trans fat consumption was found to be linked with more negative and less positive emotions in a large population of US adults, controlling for a wide range of other variables. A higher ratio of omega-6 to omega-3 fats was also associated with less positive emotions.
These findings are consistent with other evidence that dietary fat intake can affect mood, but as the study was purely observational, they cannot in themselves demonstrate causality.