Sweet Relief? Short-Term Post-Traumatic High-Sucrose Intake Attenuates Acute but Not Long-Term Fear Responses in Mice

People often turn to sweet foods for comfort during times of stress, as energy imbalance is implicated in several neuropsychiatric disorders including post-traumatic stress disorder (PTSD). Although acute sucrose consumption may improve cognitive capabilities, its long-term effectiveness has been debated. Objectives: In a widely used mouse model, we examined the effect of sucrose drinking on conditioned fear-induced freezing (as a model of PTSD), with emphasis on the concentrations and timing of the intervention as well as sex differences. We aimed to develop a low-cost, widely accessible therapeutic option. Methods: A short electric foot shock was used for trauma, and freezing was detected 24 h (mimicking acute stress disorder, ASD) or 14 days (PTSD-like symptoms) later in the trauma context and with trauma cues. Results: First, we confirmed that our trauma increased freezing, independent of previous habituation to sucrose drinking. Next, we confirmed that 16% and 32%, but not 2% sucrose drinking for 24 h (but not 3 h) immediately after trauma, diminished freezing behavior the next day. However, the same intervention did not influence behavior 14 days later. Moreover, we could not find any curative effect of 24 h of 16% sucrose consumption before testing remote fear memory 14 days after trauma. Conclusions: Consuming a high-calorie solution immediately following trauma for 24 h may influence ASD but does not necessarily alter the development of PTSD symptoms. Here, we offer a new perspective on energy regulation in neuropsychiatric disorders.