An obesogen is a fancy word that means something that can make you gain weight. Think of it like a bad guy who sneaks into your body and tells it to store extra fat, even when you don't want it to.
Obesogens can be found in many different things, like the food you eat, the air you breathe, and even the products you use to clean your house. They can be really hard to spot because they're not always listed on labels, but they're there, lurking around and making you bigger.
To protect yourself from obesogens, you can try to eat healthy foods that aren't processed or full of preservatives. You can also try to use natural cleaning products instead of ones with lots of chemicals. And always try to get outside and play, because exercise can help keep those obesogens away!