How is there vegetarians/vegans on tumblr that willing CHOOSE to become fat? It loving boggles my mind. Thin privilege is just whining, being in shape and exercising does a lot of good for the body. Of course you shouldn't disparage fat people, but don't whine about the fact that the extra ice cream you ate last night is making your clothes more expensive, or that most guys by default prefer girls who have the motivation to maintain a healthy weight (underweight isn't that hot either)
Seriously, even exercising occasionally gives a great boost to mood, confidence, and some minor health benefit. I wish I myself had more motivation to get in shape.