Adding sugar to coffee makes you sleep worse at night😱😱... Why?🤔🤔

A study has shown that adding sugar or sweeteners to coffee can cause more sleep disturbances and reduce sleep quality compared to drinking black coffee. The research team from the Graduate School of Biomedical Sciences at Hiroshima University in Japan reported that experiments with mice indicated that adding sugar or sweeteners to coffee enhances the 'owl' (nocturnal) effect of caffeine.

Associate Professor Yu Tahara, the principal investigator of the study (Biomedical Engineering), stated, "Coffee with sugar or artificial sweeteners has been shown to further disrupt the biological clock. (Due to the sweetness of the coffee) it can even cause a reversal of day and night." Therefore, if this owl-like effect applies equally to humans, sweet coffee made with sugar or sweeteners could have a negative impact on health.

The research team mixed a sweetened caffeinated beverage containing 0.1% caffeine, which is half the concentration of espresso, with either 1% sucrose (equivalent to one-tenth the concentration of energy drinks) or 0.1% saccharin (a sweetener), and had mice drink it. As a result, mice that consumed this caffeine-sweetener mixture experienced a very long 'free' sleep-wake cycle lasting 26 to 30 hours. Some mice even had their circadian rhythms altered.

This owl (nocturnal) effect continued to occur even when mice were in darkness. This suggests that the effects of caffeine and sweeteners operate independently of the 'suprachiasmatic nucleus (SCN),' the central regulator of the biological clock located in the hypothalamus of the brain. This central regulator is generally controlled by light and natural day-night cycles, resulting in synchronization of clocks in other organs and tissues of the body.

According to the research team, the combination of caffeine and sugar or sweeteners can create opposing signals within the body that are regulated by dopamine, a neurotransmitter associated with the excitation of nerve cells in the brain. Both caffeine and sugar or sweeteners activate the brain's reward system, causing the release of dopamine.

This research result (Sweetened caffeine drinking revealed behavioral rhythm independent of the central circadian clock in male mice) was published in the journal ≪npj Science of Food≫, which is published by the international academic journal ≪Nature≫.

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Recently, I switched from mixed coffee to black coffee.

I did it~~ haha, it seems I had a good sleep.

Have a happy day^^