Diets containing long-chain n-3 polyunsaturated fatty acids affect behaviour differently during development than...

Area of Science:

• Neuroscience
• Nutritional Science
• Animal Behavior

Background:

• Essential fatty acids play crucial roles in brain function.
• Long-chain n-3 polyunsaturated fatty acids (LC n-3 PUFAs) are vital components of neuronal membranes.
• Dietary intake of LC n-3 PUFAs can influence cognitive processes and behavior.

Purpose of the Study:

• To investigate the impact of diets enriched with fish oil (high in LC n-3 PUFAs) versus palm oil on the behavior and learning abilities of mice across different age groups.
• To determine age-dependent effects of LC n-3 PUFA supplementation on cognitive function and activity levels.

Main Methods:

• Two groups of OF1 mice (pregnant, lactating, and offspring) were fed either a standard diet or a diet supplemented with high levels of LC n-3 PUFAs from fish oil.
• Behavioral assessments included exploratory activity, locomotor activity, habituation, Morris water maze (place learning), and active avoidance tests.
• Mice were studied at young, mature, and old ages.

Main Results:

• Fish oil-enriched diet led to faster weight gain in young mice.
• Young mice on the fish oil diet showed increased exploratory and locomotor activity and enhanced avoidance learning.
• Mature mice on the fish oil diet demonstrated improved memory retention in the probe trial of the Morris water maze.
• Old mice on the fish oil diet exhibited reduced locomotor activity and impaired active avoidance learning compared to controls.

Conclusions:

• Dietary enrichment with long-chain n-3 polyunsaturated fatty acids positively impacts arousal and learning in young mice.
• The same dietary intervention appears detrimental to learning and activity in aged mice.
• Age is a critical factor in the neurological and behavioral outcomes of LC n-3 PUFA supplementation.