system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do antibiotics and hormones make you gain weight.

I have heard that antibiotics and hormones are used to make cattle larger. I have also observed in my own experience that when I have taken antibiotics I gain a lot of weight without changes to diet and exercise.
gpt
Depends on the antibiotic you're using.  Some do cause an increase in appetite, but generally the newer ones have less side effects like that.  Hormones are completely different.  Depending on the hormone, you will see an dramatic increase in appetite.  Some hormones cause water retention as well this creating an increase in weight.  Not sure if that helps.