If you havn't heard of think privilege it's a blog on tumblr that basically complains about how put down fat people are by society. They aim to fight 'fatfobia' and convince people you can be overweight and healthy.

Here's a typical post from TP

what do you think? do you agree? are they trolling ? is it comedy?
http://thisisthinprivilege.tumblr.com/page/2

Well, it's the work + weight pressure.

lmao ignoring medical advice isnt social justice

Health at every size is a myth. If you don't believe a doctor, who are you gonna believe?

I like the blog because I think that occasionally their stories of differences in treatment between fat and thin people ring true. For example things like: if a fat person gets food on their shirt, they´re seen as gross and a lob, if a thin person does the same, no one cares.
It's a shame however that they feel the need to supplement the reader-submitted stories, some of which can be insightful, with long articles of pseudoscience, angry rants on things that are either impractical or just unrealistic, and encouraging people to buy into bullcrap that's supposed to make them feel better about their lives rather than allowing them to take charge and change something about themselves.

They are a mess.

That quoted post reads as trolling/satire.

http://www.reddit.com/r/fatpeoplestories/

I do think fat people are shamed publicly a lot for no reason. Look at how ATRL attacked Xtina for gaining a few pounds.

I never heard of "health at every size" before, but it's a proven fact that being too overweight isn't healthy. I'm not sure where that came from.

Like cmon this has to be a troll

They aren't trolling, sadly

You know you're morbidly obese when you can't fit in a turnstile

the doctor is right, but she's bending his/her words
or this may be fake.

and yes, being obese is not healthy. the hell she thinking

Health at every size is ********. Being too overweight or too underweight increases your chances of developing a number of illnesses as a result. We need to stop sugarcoating issues like obesity just so fat people don't get offended.

This

The more overweight you are the more strain is put on your body.

Honestly most of these people are just lazy and don't want to workout, so they champion themselves on how they are comfortable with being overweight. I understand that you can be overweight and still have a healthy diet, but it's the added pressure on your body from having extra weight which causes the health issues.