Prolonged Consumption of Sweetened Beverages Lastingly Deteriorates Cognitive Functions and Reward Processing in Mice

Area of Science:

• Neuroscience
• Behavioral Science
• Nutritional Neuroscience

Background:

• Sweetened beverages are widely consumed globally.
• Potential long-term neurological effects of chronic consumption are not fully understood.
• Metabolic effects of sweeteners often overshadow potential cognitive impacts.

Purpose of the Study:

• To investigate the detrimental effects of chronic consumption of sweet or sweetened beverages on brain function in mice.
• To examine the impact of sucrose and artificial sweeteners on reward systems and decision-making processes.
• To explore alterations in brain neurochemistry and cognitive functions.

Main Methods:

• Chronic administration of sucrose or artificial sweeteners (saccharin) to mice.
• Assessment of prefrontal cortex activation patterns using neuroimaging techniques.
• Analysis of dopamine content and turnover in brain tissue.
• Evaluation of decision-making strategies and cognitive flexibility.

Main Results:

• Consumption of low doses of sucrose or artificial sweeteners impaired reward system activation.
• Abnormal risk-taking behavior and delayed decision-making strategy establishment were observed.
• Disruption of brain regions involved in decision-making and reward processing.
• Significant alterations in brain neurochemistry (dopamine) and high cognitive functions.
• Metabolic regulations remained largely unaffected.

Conclusions:

• Chronic intake of sweet or sweetened beverages, even at low doses, negatively impacts brain function.
• These beverages can lead to altered decision-making, cognitive inflexibility, and neurochemical changes.
• The long-term neurological consequences of these beverages warrant further investigation in humans, as they may be metabolically silent.