Açai pulp improves cognition and insulin sensitivity in obese mice

Area of Science:

• Neuroscience
• Metabolic Disorders
• Nutritional Science

Background:

• Obesity and insulin resistance are risk factors for neurodegenerative diseases like tauopathies.
• Polyphenols are being studied for their neuroprotective properties against neural damage.
• The effects of Amazonian açai pulp (AP) on diet-induced cognitive decline are not well understood.

Purpose of the Study:

• To investigate the preventative effects of AP on memory and cognitive impairment caused by a high-fat diet in mice.
• To examine AP's impact on peripheral insulin resistance and tau protein stability.
• To explore the role of the AKT/GSK3-β signaling pathway.

Main Methods:

• Mice were fed a high-fat diet, with some supplemented with 2% AP for 70 days.
• Peripheral insulin resistance, recognition memory, and tau protein stability were assessed.
• AKT/GSK3-β signaling pathway, catalase activity, and reduced glutathione (GSH) were analyzed.

Main Results:

• AP consumption improved peripheral insulin sensitivity and AKT/GSK3-β phosphorylation in mouse hippocampi.
• Mice supplemented with AP demonstrated enhanced performance in the novel object recognition test (NOR).
• Catalase activity and reduced glutathione levels were improved in AP-treated mice.

Conclusions:

• AP supplementation can mitigate the adverse effects of high-fat diets on peripheral insulin resistance.
• Açai pulp intake improves cognitive behavior and may offer neuroprotection against diet-induced impairments.
• AP shows potential as a dietary intervention for preventing metabolic and cognitive decline.