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Since fingernails must have more of a purpose than for creating cool manicure styles, this article will take a look at why we have fingernails and toenails — and the clues they give us about overall health.

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Your fingernails can say a lot about your health, and nutrient deficiencies may affect your nails' appearance. Here are 8 important vitamins and…

Fingernails have greater blood flow, in part because they’re closer to your heart. The legs and feet are also subject to greater concerns related to blood flow, such as deep vein thrombosis or other peripheral vascular diseases. This can affect toenail growth and toenail function.

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The way keratin cells link to form together can influence the consistency and feel of the fingernails. For example, the nail layers are made of soft, moderately hard, and hard keratin. These all come together to create the protective shield you know as your fingernails.

Some slight differences in purpose are reflected in rates of nail growth. Fingernails grow around twice as fast as toenails, according to a small 2010 study.

This study of 22 healthy American young adults found that fingernails grow an average of 3.47 millimeters (mm) a month, while toenails grow an average of 1.62 mm a month.

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While the keratin cells are no longer living (which is why you can trim your fingernails and toenails), they represent formerly living cells that needed nutrients and proteins to survive.

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When you consider this, it’s easy to see how deformities in the nails can indicate potential underlying problems, such as nutritional deficiencies. (More about this in the next section.)

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Can you imagine if your fingertips tried to roll backward when you held something? The strength and existence of fingernails helps keep this from happening (thank goodness!).

The tops of the toes are vulnerable to injury and, as we’ve all learned the hard way, stubbing. By having a protective nail on top of the toe, the toes are less vulnerable to injury and infections.

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Fingernails comprise three layers of tissue called keratin. Keratin is a tissue type that has amino acid proteins. Keratin is naturally present in your hair and nails. It’s also a component found in other animals, including horse hooves.

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The main function of toenails is likely for protection, compared to enhancing grip or the fine motor functions the fingernails have.

According to an anthropology professor at the University of Wisconsin-Madison, fingernails are present in all primates, including humans, monkeys, and apes, to support our fingertips.

Ideally, your nails are pink at the nail beds, slightly rounded, with small, shallow vertical lines. If you have variations of this standard appearance that concern you, talk to your doctor.

Fingernails may be potential indicators of underlying medical conditions. In fact, doctors frequently assess fingernails to help diagnose different medical conditions.