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Lack of Light as a Child Could Lead to Blood Sugar Problems, Study Finds

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A recent study revealed that insufficient light exposure during childhood may lead to issues with blood sugar control.

A visual aid to illustrate the article\'s content. / kapinon.studio-shutterstock.com
A visual aid to illustrate the article’s content. / kapinon.studio-shutterstock.com

Rejji Kuruvilla and his research team from the Department of Biology at Johns Hopkins University published their groundbreaking findings in the prestigious journal Science Advances.

The team conducted a comparative study on the metabolic processes of rats raised in complete darkness for eight weeks versus those raised in an environment alternating between light and darkness.

The results showed that male rats raised in darkness secreted more insulin and less glucagon than their light-exposed counterparts. The pancreas produces these hormones, which are crucial in regulating blood sugar levels.

Dark-raised male rats struggled with converting non-carbohydrates into blood sugar and had difficulty breaking down lipids efficiently. The sympathetic nervous system typically supports these metabolic processes.

The researchers concluded that the absence of light interferes with the activity of the sympathetic nervous system, leading to metabolic disruptions.

To test their hypothesis about weakened sympathetic nervous system function, the team exposed the rats to cold stimuli and observed their reactions.

Fascinatingly, the dark-raised rats showed a diminished response to cold stimuli. This impairment became more pronounced the longer they lived in darkness.

The study also found that exposing dark-raised rats to light environments could improve their metabolism. When these rats were given a balanced light-dark cycle (12 hours each) for five weeks, their metabolic function showed partial recovery.

The research team emphasized that their findings indicate prolonged exposure to dark environments could lead to insulin resistance, glucose intolerance, and weight gain. While acknowledging that further research is necessary, they believe these effects may also apply to humans. They added optimistically that deepening our understanding of how light impacts metabolism could unlock new strategies for treating conditions like diabetes and obesity.

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