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(WZZM) - The time of day you're in the sunlight could impact your weight.

Researchers found people who got most of their light exposure early in the morning had a significantly lower body mass index. BMI is the measurement of body fat based on height and weight.

Here's how it works: early morning light waves have more of the blue light that can impact your sleep-wake cycle or circadian rhythm.

That cycle plays an important role in regulating metabolism. Researchers say the key time to get bright light is between 8am and noon, but don't forget the sunscreen.

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