· 7 min read · 10 sources
What does blue light do to your circadian rhythm?
Blue light suppresses melatonin and shifts your body clock. But intensity and timing weigh more than colour, and people differ more than lamps do.
Read articleSystematic reviews
These articles carry the search that gathered the evidence: which database, which terms, which date, and what was included and excluded. Paste it into that database and you get the same list back.
· 9 min read · 13 sources
Do blue light glasses help with tired eyes?
One trial found the relief wearers report. Another swapped the lens for an equally dark grey one, and the benefit disappeared. What is left that works.
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· 9 min read · 12 sources
Do blue light glasses help you sleep? 31 trials read
Cochrane found no trial free of bias risk. The gap between what people feel and what the equipment records explains almost everything.
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· 5 min read · 7 sources
Is light therapy safe if you have or have had cancer?
The worry comes almost entirely from cell cultures. The reassurance comes from patients. What the clinical evidence says, and the question nobody asked.
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· 5 min read · 10 sources
Red light and your brain: a search of 81 studies
Several meta-analyses say red light on your head helps memory, and there is now a home-device trial. What was measured, and where the evidence is thin.
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· 6 min read · 12 sources
Is red light bad for your eyes? A 488-study search
Thousands of children have had red light shone straight into their eyes for myopia. What those trials showed about safety, and where harm did happen.
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· 5 min read · 11 sources
Does red light work for pain? Why 412 reviews disagree
There are 412 systematic reviews on light and pain, and they do not agree. What the full texts say that the abstracts leave out, condition by condition.
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· 4 min read · 6 sources
Does red light help wounds heal? It depends on the wound
In diabetic foot ulcers red light nearly doubles the chance of healing. In venous leg ulcers it does nothing. Wound healing is not one outcome.
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· 13 min read · 12 sources
Which health tracker is accurate, and is it safe to wear one all day?
Per measurement, from the validation studies, with what we would pick for each one. Plus the other half nobody asks: what a sensor strapped to your skin around the clock is actually doing to it.
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· 5 min read · 6 sources
How bad are sugary drinks, and how do you drink one least badly?
In trials where adults were given one sugary drink a day on top of their normal diet, they gained 0.83 kg. Taking one a day away gave half a kilo back. And when you do have one, what is already in your stomach decides how big the sugar spike is.
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· 10 min read · 14 sources
Is chewing gum bad for you? What your body thinks is coming
The worry is that chewing gum makes your body release insulin as if food were coming, which would matter if you are fasting. Chewing does send that signal, with saliva and gut hormones. When researchers measured the insulin, it had not moved.
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· 11 min read · 13 sources
Nattokinase: effects and side effects, from 341 studies
Every human trial of nattokinase, read and reported: what it does for plaque, blood pressure and clotting, and where the best trial found nothing.
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· 6 min read · 7 sources
Is your phone next to your bed ruining your sleep? Not the radiation
The radiation has been measured in thousands of people and nothing turns up. The device does turn up, and almost all of it is the half hour you spend holding it in bed.
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· 6 min read · 8 sources
Do posture correctors work? What the research shows
We screened 324 controlled trials. The strap itself has never been tested, and in the one sham trial the fake shirt outperformed the real one.
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