This is a good question, and one I did not know
the answer to so I turned to the web.
Apparently, the burps are caused by "toxic"
compounds found in the flesh of cucumbers. These
compounds, known as cucurbitacins, are what
cause the bitter taste as well. "Burpless"
cucumbers have been cultivated to have less
cucurbitacins. The amount of cucurbitacins in
cucumbers can increase during growth as a result
of water or heat stress.
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