Is it common for our own eating habit to change after incorporating cardio exercise into our daily routine?

I recently started to do a workout routine from these workout cards I found online.
I tried one set at first because that's all my body could take on the first day, and I felt like my diet is changing because of it.
I mean at first it's just like wanting to rest and drink more water because of sweating and dehydration...but I realized that my eating habit is changing slowly.

Before I started doing it, I just sorta eat a lot and maybe a bit of exercise...but no actual cardio.