Taste triggers a homeostatic temperature control in hungry flies

Area of Science:

• Neuroscience
• Animal Behavior
• Metabolism

Background:

• Hunger drives food-seeking behaviors, but the mechanisms linking food sensation to acute responses are unclear.
• Drosophila melanogaster (fruit flies) exhibit a low-temperature preference when hungry, indicating a lower metabolic rate.

Purpose of the Study:

• To investigate how taste sensation triggers behavioral changes in hungry flies.
• To understand the roles of taste and nutrient intake in starvation recovery.

Main Methods:

• Utilized artificial sweeteners and optogenetics to stimulate taste receptors in Drosophila.
• Monitored temperature preference shifts in response to taste stimulation and nutrient intake.
• Investigated the influence of clock genes and hunger signals on taste-evoked responses.

Main Results:

• Taste stimulation acutely triggers a preference for warmer temperatures in hungry flies.
• Nutrient intake, not just taste, is necessary to achieve a 'fed' state.
• Taste-evoked and nutrient-induced warm preferences are distinct components of starvation recovery.
• Clock genes and hunger signals significantly modulate taste-evoked warm preferences.

Conclusions:

• Taste sensation initiates a warm preference, a key component of starvation recovery.
• Starvation recovery involves both taste-evoked and nutrient-induced thermoregulatory responses.
• The taste-evoked response is a critical regulatory mechanism for energy homeostasis and metabolism, influenced by internal cues like hunger and circadian rhythms.