It is a regular day and you take a sip from your Nalgene bottle after a tough football game. You think that you are doing a good deed for the environment by reusing this unbreakable bottle, but what you don’t realize is that you are most likely affecting your body in a negative way.

Nalgene bottles contain Bisphenol A. It is a chemical that affects your hormones and can lead to trouble in reproducing and keeping hormonal balances. The only way to know if your bottle contains this chemical is by looking inside the triangle on the bottom of the bottle. If the number inside of the triangle is 7, than you have a problem. Don’t worry, you won’t die, but my best advice is to throw it away.

It is not only the Nalgene bottle that has this undesirable chemical. It is in most plastics that we use every day to store food, liquids and those tasty leftovers from dinner. You should be relatively safe when it comes to those Tupperware containers. However, they can become dangerous when you microwave some of those delicious leftovers in them. When you heat Tupperware in the microwave or dishwasher, negative chemicals can spread into the food or liquid. You don’t want your little brother or sister eating dangerous foods like that.

Lastly, I would like to warn you not to use the recyclable water bottles more than once! Yes, I am talking about those Gatorade, Dasani, Poland Spring bottles. Once you use them more than once, they become cloudy and scratched, which means there are more open scratches that can help spread bad chemicals into the liquid.

So just remember to think when you come off that field and decide to take a gulp of that delicious water. Make sure that the small triangle under the bottle does not have 7 on it. If it does and you drink from it, your hormones may be in danger.