Sucralose Promotes Food Intake through NPY and a Neuronal Fasting Response.

Area of Science:

• Neuroscience
• Metabolic Science
• Animal Models

Background:

• Non-nutritive sweeteners (NNS) are widely consumed globally.
• Studies suggest a link between NNS and metabolic dysfunction, but mechanisms are unclear.

Purpose of the Study:

• Investigate long-term effects of sucralose-induced sweet/energy imbalance.
• Elucidate the neurobiological mechanisms underlying metabolic dysregulation from NNS.

Main Methods:

• Dietary sucralose supplementation in Drosophila melanogaster (fruit flies).
• Analysis of behavioral, metabolic, and neural pathways.
• Mammalian models to assess conserved mechanisms.

Main Results:

• In flies, chronic sucralose intake caused hyperactivity, insomnia, glucose intolerance, and increased appetite.
• These effects were reversed upon sucralose withdrawal.
• Mechanisms involved insulin, catecholamine, NPF/NPY systems, and AMPK, forming a novel starvation response pathway.
• Mammals also showed increased food intake via an NPY-dependent pathway.

Conclusions:

• Chronic consumption of sweet/energy imbalanced diets triggers conserved neuronal fasting responses.
• This pathway increases food intake motivation and contributes to metabolic dysregulation.
• Findings highlight potential risks of widespread NNS consumption.