Can obesity be a culture?

I have to write a research based essay on what we think defines our own culture and frankly I can’t think of anything (I’m trying to avoid music and technology because many others are doing that topic) to write about. I thought about chosing obesity because I’ve always been a little overweight all my life and when I was younger I had terrible eating habits which led to me having Diabetes Type II. So it like changed my way of life. Is it an acceptable idea to write about obesity as a culture? I’m lost…