They are actually an embodiment of all the seven deadly sins.   Gluttony - Obviously.   Greed - Clearly, again, but they're also usually greedy with respect to more than food - it's just that their greed for food has a physical manifestation.   Sloth - Obviously.   Envy - From all their blogging, complaints about "thin privilege" and bitter talk about the human-sized people in their lives, they would give anything to be like actual human beings. Except eat less or exercise.   Pride - They take "fierce", "sexy" photos of themselves constantly - they are the worst and most shameless narcissists in the world today. Normal people would never do this, and would be shouted down if they did. And they also hype up other minor accomplishments in life to compensate. "I have a stressful important job!", "I have children!", "I'd rather be smart!", "I have plenty of sex!" etc. They're also very proud of their various ailments that they can use as an excuse - normal people don't boast about such things, or even mention them.   Wrath - Just look how angry they all are. Mention anything about their weight, or even that being thin is better than being fat, and they will make it their life's goal to destroy you. And if you know any, you'll know they're just angry about everything in life. Every little problem makes them explode - they're like children.   Lust - all the "sexy" selfies, the constant need for sexual validation, the boasting of their sexual histories - and the demand for hot, fit partners that they broadcast loudly and constantly. Again, normal people don't do this and would be ridiculed if they did.