I’ve seen headlines about a potential link to hair loss lately.
hair loss is a symptom that fits into that category.
Crashing intakes tend to be self-regulating; you cannot really eat very little food for long periods without suffering.
GLP-1s make it very easy to crash your intake by simply injecting a higher dose, so the "negative effects" of crash dieting are easier acquire on GLP-1s for vast majority of population.