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You are probably exposed to sunlight on a daily basis and know of its health effects. But you may not know that too much or too little sunlight holds no health benefit.
For example, a recent study found that sunlight helps prevent dementia—but only when exposure is moderate. Why is that? And how much is "moderate"?
Exposure to Sunlight Prevents Dementia
Recently, Professor Jintai Yu’s team from Fudan University in China, together with Professor Lan Tan’s team from Qingdao University, conducted a study that included more than 360,000 people with up to nine years of follow-up. 
The research concluded that average daily exposure to 1.5 hours of sunlight could prevent dementia, but too much or too little sunlight was harmful to health. The study discovered for the first time the relationship between hours of outdoor light exposure and dementia and provided a new idea for dementia prevention. The study was published in BMC Medicine on April 25, 2022....