Health Claims

Too much blue light messing with your sleep clock might also be bad for your mood, brain, and metabolism — not just your sleep.

Wearing blue light-blocking glasses, using screen filters, adjusting room lighting, and managing screen time may help reduce the negative effects of blue light on your sleep and body clock — but we still need more research to be sure how well these work for everyone.

Being around too much blue light at night, like from phones or lamps, can mess with your sleep and your body's internal clock, making it harder to fall asleep and feel rested.

Feeding female Chinese sturgeon a diet with 18% fat might help their ovaries develop better by boosting key body processes that make yolk and support egg growth.

Female Chinese sturgeon fed a high-fat diet with 18% lipids end up with more fat in their blood over time compared to those on lower-fat diets, which means their bodies are holding onto more fat when they eat more fat.

Female Chinese sturgeon on a high-fat diet have bigger egg cells with more fat stored inside them, which might help their eggs grow better early on.

Feeding female Chinese sturgeon a diet with 18% fat helps their ovaries mature fully over two years, but lower-fat diets don’t do the same — so more fat in their food might help these endangered fish reproduce better.

Cool white LED lights might mess with your sleep more than old-style light bulbs because they affect your body's internal clock more, even if they look just as bright. Old incandescent bulbs are gentler on your circadian rhythm at night.

Incandescent light bulbs are the least likely to mess with your sleep at night because they give off less of the blueish light that tricks your brain into staying awake.

Wearing brown-tinted blue-light-blocking glasses like Swanwick or THL Sleep at night might help protect your sleep hormone way better than other blue-light glasses by blocking more of the light that messes with your body clock.

Changing your LED light from cool white to warm white in the evening can cut down how much it messes with your sleep hormones by over 99%.

Cool white light bulbs, like some LEDs and CFLs, might mess with your sleep more than warm yellowish ones because they can reduce a sleep hormone called melatonin more strongly.

In normal mice, the hormone TSH goes up and down during the day depending on light conditions — peaking at certain times in the dark and showing two peaks when there's a regular light-dark cycle — but another hormone, T4, stays pretty steady all day long.

In mice, a clock-related protein in certain hormone cells turns on at night, and this timing shifts when a specific receptor is missing — meaning the body might fine-tune its internal clock after genes are read.

Mice that are missing a certain brain signaling system have their daily body clock in the thyroid gland running about 5 hours earlier than normal mice — this suggests that the signaling system helps set the clock in that organ.

Mice that are missing a certain brain signaling system have weaker daily rhythms in their thyroid gland, which suggests this system helps keep the body's internal clock running strongly in that organ.

Even when the brain's main body clock loses its rhythm, the thyroid gland in mice can still keep its own daily rhythm going — suggesting it doesn’t completely depend on signals from the brain’s clock center.

There's a computer model that can mimic how our thyroid hormones rise and fall during the day, and it works by timing how the body converts one hormone into another in different places, with the body's tissues getting a 3-hour head start over the thyroid gland.

The body’s internal system that turns one thyroid hormone into another isn’t enough on its own to explain the timing and levels of these hormones throughout the day.

Your body's daily rhythm of thyroid hormones isn't caused by just one thing—like the thyroid working on a schedule or how the hormone moves through your blood. It's more complicated than that.

Dogs with an underactive thyroid tend to have more belly fat, which might make their bodies less responsive to insulin, but their stress hormone levels don’t seem to go up.

Dogs with an underactive thyroid might have higher levels of certain growth hormones, which could make their bodies less responsive to insulin.

Dogs with artificially lowered thyroid levels still process sugar normally, and their insulin system works just as well as healthy dogs.

Dogs with artificially lowered thyroid function become less responsive to insulin, so their bodies make more insulin to keep blood sugar under control.