It's a lesser known aspect of narcissism to get enjoyment out of making people uncomfortable. This can be through behaviour, like for example inappropriate nudity.I think influencers are the most influenced. How can she watch other videos, like wieiad from people much smaller than her and not question her own food choices? We can all see that she has a food addiction, but she doesn’t appear to recognise that she has a huge problem. Unless she gets pleasure from shocking people and goading them with her gluttony? Deep down, she’s obviously not happy.
But, many narcissistic people have offensive traits by choice. Poor hygiene, grotesquely overweight etc. One way to ensure you're the centre of attention at all times is if you literally need to be taken care of.