Genuine question, how are all influencers so skinny?

As a long time follower of many of the NYC influencers, I have seen most of them get thinner and thinner over the years. Was watching an Ella Rose vlog the other day, and her tummy and arms look so much skinnier and more in shape than they used to be. She doesn’t seem to workout too much in her vlogs..am I missing something? What are they doing that they aren’t sharing?