Alexithymia and caffeine: the role of caffeine expectancies and craving

The associations between alexithymia and both non-suicidal self-injury and risky drinking: A systematic review and meta-analysis

BACKGROUND

Nonsuicidal self-injury (NSSI; direct harm to the body without suicidal intent) and risky drinking are two behaviours that serve emotion regulatory functions. When underlying emotional problems are untreated, individuals may shift between NSSI and risky drinking. Both behaviours are associated with alexithymia, difficulties identifying and describing emotions and retaining an externally orientated thinking style. However, it is unknown to what extent the associations are similar and under what circumstances (e.g. sex, age) they may differ.

METHOD

To compare both associations we conducted an extensive review using several databases. Overall, 20 NSSI-related articles and 33 risky drinking-related articles met the inclusion criteria.

RESULTS

A meta-analysis revealed significant positive associations between total alexithymia scores, difficulties identifying feelings, difficulties describing feelings and both NSSI and risky drinking. However, these associations appear stronger for NSSI. Further, externally orientated thinking was associated with risky drinking but not NSSI. Age had opposing moderating effects on the relationships, with the association between alexithymia and NSSI being stronger in younger samples and the association between alexithymia and risky drinking being stronger in older samples. Further, the association between alexithymia and NSSI was stronger for female only samples compared to male only samples.

LIMITATIONS

The review was limited to English articles. High levels of heterogeneity were observed. The majority of the studies included were cross-sectional.

CONCLUSION

These results imply that NSSI and risky drinking may have both shared and distinguishable correlates. Alexithymia can be targeted in treatment to potentially reduce the likelihood of individuals shifting between behaviours to regulate their emotions.

Is it the Taste or the Buzz? Alexithymia, Caffeine, and Emotional Eating

BACKGROUND

Alexithymia, a relatively stable personality trait characterized by difficulties identifying and describing feelings and externally oriented thinking, has been linked to both substance use disorders and eating disorders. In nonclinical samples, alexithymia is associated with heavier consumption of alcohol and caffeine. Both are psychoactive drugs, but unlike most drugs they are typically consumed in the context of palatable and calorie-rich products.

OBJECTIVES

Given the association of alexithymia with disordered eating, the present study evaluated the hypothesis that heavier consumption of caffeine by those with high levels of alexithymia may be motivated by the palatable and caloric aspects of common caffeine products rather than by drug-seeking.

METHODS

There were 224 participants aged 17-63 years who completed instruments assessing demographics, alexithymia, emotional eating, caffeine consumption, alcohol consumption, negative moods, and reward sensitivity.

RESULTS

As predicted, alexithymia was positively related to emotional eating as well as consumption of caffeine and alcohol, and alexithymia was a significant predictor of caffeine intake in regression models. However, there was no indication of mediation by emotional eating.

CONCLUSIONS

Alexithymia is characterized by deficient emotion regulation and negative moods, hence use of drugs and/or foods to regulate emotions, combined with poor interoceptive awareness, may account for excessive consumption of drugs or foods as alternative emotion regulation strategies in those with high levels of this trait.