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Blue Light at night causes rise in sugar consumption in rats

Blue Light at night causes rise in sugar consumption in rats

Wednesday 24 July 2019

New research has revealed that rats that are exposed to blue light at night develop a sweet tooth. The research was presented at an annual conference for the Society for the Study of Ingestive Behaviour that took place between 9 – 13 July this year. A team from the University of Amsterdam and the University of Strasbourg presented the research they had gathered.

During the experiment, researchers changed rat’s nocturnal habits so that they are awake during the day and asleep at night in order to best replicate human’s body clocks. Male rats were used and were exposed to blue light for one hour at night and then the following day had their food consumption and glucose tolerance levels assessed.

The rats were given the choice of standard rat food or a mixture of sugar water, water and lard. This was then compared to rats who were not exposed to blue light at night but presented with the same food choice.

The results found that the rats who were exposed to blue light at night consumed more of the sugar water mixture than the rats that weren’t exposed to blue light. Additionally, glucose levels were altered in the rats which are a warning sign of type-2 diabetes. Scientists behind the research concluded that perhaps exposure to blue light at night could lead to weight gain and the development of diabetes in humans due to the sugary eating habits.

This is supported by research from another study earlier this year which found a link between artificial light at night and obesity in women. Read our blog here to find out more.


  1. Evening Blue Light Exposure increases sugar consumption in rats.

  2. Blue light triggers sweet tooth in rodents, study shows.

  3. Blue light at night increases the consumption of sweets in rats .


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