Cachexia is the cause of one third of cancer deaths. They send cancer patients to strength training because somehow their muscle mass factors into their ability to survive the onslaught.

Many people who have been vegan for a long time miss hitting their macros for so long that they trigger auto-immune disease down the road. Even with eating the huge amounts of vegetables they ingest trying to do so, eventually a form of cachexia hits them too.

What is cachexia?

https://my.clevelandclinic.org/health/diseases/cachexia-wasting-syndrome

So… you are not imagining it.