system
Given the following post, respond as if you're commenting on Reddit:
human
Can insects/spiders get obese?
gpt
Arachnid keeper here! As far as arachnids go they can become obese from being overfed in captivity. You are very unlikely to find an obese arachnid in the wild as most arachnids are opportunistic feeders which means a meal is whatever comes their way at the time. It could be days, weeks or even months between their meals! They are built to survive like this though by storing energy in their bodies and that allows them to survive even a year without food! 

For example, a tarantula that is obese will appear to have an extremely plump abdomen and will be rather slow compared to others of it's genus. An obese tarantula may run into quite a few problems also, such as trouble shedding their exoskeleton. A fall could also be life threatening as just enough height and it will burst, killing the tarantula.

I hope this has been insightful!