It’s part of your body’s 3F response – as stated in other replies, your body diverts resources to where they’re needed most so as to optimize your systemic functions for survival.
When you vomit from overexertion, your body has calculated that the energy cost of holding on to & processing your stomach contents, is less helpful when compared to up-chucking. The factors include weight, nutrient levels, accessible energy stores, and many others!
Disclaimer: I am not a healthcare professional.
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