It’s hard not to judge people the moment we meet them. Afterall, our brains are trying to quickly process what we see and think about someone, and it doesn’t mean we are judging them poorly either.

We might be thinking really great things about someone we’ve just met: “they have great hair, beautiful eyes, a nice smile, infectious laugh!” Sure, we tend to think that judging people is a negative thing, but it doesn’t have to be. It’s just what people do.

Here are six things science says you can tell about a person just by the way they look.

1) Your Personality

Even though first impressions are important and we often do the most judging during those times, some studies suggest that no matter what angle we meet someone at, we are able to determine their personality traits quickly.

A study, conducted at the University of Texas, showed participants photos of people with two different poses: one where they posed however they felt like and another  where they faced the camera with a neutral expression.

After, participants were asked to judge them on their personality. No matter which photo they looked at, most viewers were fairly accurate.

People were particularly good at judging someone’s levels of extroversion, open-mindedness, religiosity, and self-esteem.

So, if you’ve ever known someone who “wears their heart on their sleeve” you know that you can tell how a person is feeling or what they are thinking just by the look on their face.

2) Your Physical Strength

Men with strong jawlines have commonly been associated with having a great deal of strength. This continues to be true in this modern age.

A study showed that people with strong jawlines are thought to have more physical strength than someone who has a weaker jawline.

In the same study, participants said people who were smiling were more friendly as well.

So if you want to be thought of as strong and friendly, let a smile run across that manly jaw once in awhile.

3) Your Health

You can tell a lot about someone just by the way their skin and eyes look. For example, if you meet a smoker, you can tell they are a smoker because their fingers might be stained with nicotine, they might have a yellow tint to their eyes, they might have a lot of wrinkles, and they might have yellow stained teeth.

What’s more, a study found that doctors could determine if there was something wrong with patients just by looking at their eyes. People with dull eyes were thought to be more sick than those who had glossy eyes.

4) Your Trustworthiness

A study conducted a while back took death row inmates and had people determine their level of trustworthiness based on activities in the prison and their history.

Of course, people thought inmates were more trustworthy if they had a soft looking face, or if they were smiling in their photographs.

People who smile and express themselves in an open way are thought to be more trustworthy to others.

5) Penis size…ummm, what?

Finding a way to show the world how big your penis is without actually whipping it out has been a topic of conversation for people for years.

And one study found that men who had a certain ratio of index finger to ring finger size has bigger pensies. There, now you don’t have to buy that big wheeled truck: you can just show people your fingers.

6) Your Risk for Disease

Similar to the way a doctor can determine if you are ill by looking at your eyes, health professionals can determine your risk of disease just by looking at you.

For example, a study found that people who are very tall and who grew very quickly when they were young are at risk of developing cardiovascular disorders later in life.

In addition, it has been found that shorter people in general are at less risk for certain types of cancer.

So the next time you step outside the house to greet the world, think about what you appearance says about you and your life.

Although there are certain things about your appearance you cannot change, like being too tall or having a large penis — you can change your diet and exercise habits to work toward being a healthier person and reducing your risk of disease or illness in the future.