Potential of soybean-velvet bean combination tempe in improving cognitive function

Area of Science:

• Neuroscience
• Nutritional Science
• Biochemistry

Background:

• Velvet bean (Mucuna pruriens) is an Indonesian legume rich in L-dopa, yet its potential remains largely untapped.
• Cognitive decline and neurodegenerative diseases are associated with altered dopamine and beta-amyloid levels.
• Tempe, a fermented soybean product, is a staple food with known health benefits.

Purpose of the Study:

• To investigate the impact of different tempe types (soybean, velvet bean, combination) on rat cognitive function.
• To analyze the effects on brain histology, dopamine levels, and serum beta-amyloid.
• To identify key physiological parameters influencing cognitive performance.

Main Methods:

• An 8-week experimental study using a completely randomized design with five rat groups based on protein sources (non-protein, casein, soybean tempe, velvet bean tempe, combination tempe).
• Cognitive function assessed via maze completion time.
• Brain mass, volume, hippocampal histology (neuron counts in dentate gyrus, CA1, CA3), brain dopamine, and serum beta-amyloid levels were measured.

Main Results:

• Protein deprivation significantly impaired cognitive performance and reduced brain mass.
• Tempe-based diets helped preserve neuron cell number and density in the hippocampus (dentate gyrus and CA3).
• Dietary protein increased dopamine and suppressed serum beta-amyloid levels, with combination tempe showing the most promising effects on cognitive function, brain volume, and neurochemical markers.

Conclusions:

• Protein intake is crucial for maintaining cognitive function and brain health.
• Combination tempe (soybean and velvet bean) demonstrates significant potential for improving cognitive function, increasing dopamine, and reducing beta-amyloid.
• Brain volume and hippocampal neuron density are strongly correlated with cognitive performance.