I find at different times benzos have had different effects on my weight. If I'm taking a higher dose than usual, I have a diminished appetite, and if I'm busy, I can forget to eat. Just don't experience the usual hunger pangs.
At other times, usually at a lower dose on benzos, my appetite is normal, which for me, is big, but I suspect the benzos slow down my metabolism so I can easily put on weight and need to be careful.
I've also noticed that when I've tapered down to almost nothing, I drop weight, so I suspect there is a definite effect on the metabolism with benzos.
But with benzos I find if I eat moderately and exercise every day, I don't have to worry, not like when I was taking antidepressants. I think they seriously mess up the metabolism because I'd gain weight even when eating half what I normally do and exercising twice as much.