Deoxygenated blood is blue in color
The type of blood that lacks oxygen that's pumped through the veins toward the heart, is definitely not blue but it's dark red in color. Keep in mind that in school textbooks it's colored blue to emphasize the contrast with oxygenated blood. The veins you can see through your skin seem blue because the light shining on them gets refracted.
Vitamin pills keep us healthy
This is entirely not possible because vitamins only regulate processes in our bodies, and we should be careful about taking them in tablet form since an excessive amount of them can be harmful to our health.
Brown sugar is healthier than white sugar
Actually, white and brown sugar are the same thing, they just differ in terms of the use of molasses, which gives a product a darkish color. Brown sugar is often mistakenly considered healthier because it's not as sweet as white sugar, on account of the larger amount of water the former contains.
Alcohol kills brain cells
The reality is that, a large amount of alcohol affects metabolic processes in the body and can lead to a deficit of oxygen and this can harm the connections between brain cells, but it does nothing to the cells themselves.
You need to get eight hours of sleep a night
I presume that we all know that we should sleep for eight hours a night. Yet different people need different amounts of sleep, and both an excess and a lack of sleep can have negative effects on our health. For some, it's enough to sleep for six hours in order to feel great, whilst others feel exhausted even after they've been in bed for nine hours.
Chocolate gives you blackheads
There was an experiment that was done by scientists and they gave dozens of people bars that contained ten times more chocolate than normal. When they compared the number of blackheads these people had before and after the experiment, they found no differences. This might sound strange, but it's true.
Sugar is addictive
In 2009, a book came out about the results of an experiment in which laboratory mice were fed large amounts of sugar over several days. Once they'd experienced this diet, they couldn't live without the stuff. But when the experiment was repeated with human beings, the same effect did not occur. And, in fact human beings can't survive on sugar alone.
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