Is there any reason that I feel really sad and empathetic for fat people? And does anyone feel the same way?

I just feel really bad for people that are over weight. I look at them and most of them look happy or yeh know just average or okay but for some reason I feel really bad and it feels like they are depressed and it breaks my heart, yet they probably aren't depresses. My mum is over weight and sometimes when I look at her I feel so bad and my mum actually has had depression, I don't know if she still does, but I feel so sorry for her. And even sometimes when I look at my cat who is fat I feel bad and it seems like my cat is depressed, and it really breaks my heart. I dont know what it is but I wish there was no overweight-ness in the world, that everyone one could be a healthy weight inclining those underweight. Does anyone else feel the same way as me?