Hi Nathalie,
Obesity is basically too much body fat. There are a number of ways to measure this, one being the Body Mass Index. We have a section which discusses the basic information regarding weight and obesity. You can read that here.
You may want to read the obesity page at Medical News Today website or at The Obesity Society.
What obesity means on a personal level is different for each of us. Let us know if this information doesn't address your question or concerns.
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