New in Yoga

Hi everybody!!!
First of all I have to say that I am a new member, and I am glaid I joined this group.
I am very new in Yoga, actually I am practicing only one week (three times) and I really feal that I like it and finally found something that fulfills me. As I said I don’t have experience, so I have a question related with my apetite and my body.
The first thing is that as I started exercising, I noticed that my apetite is encreasing, and I eat a lot. And the second thing is that I sweat a lot, eaven when I don’t exercise.
Is this a normal reaction of my body? Does anyone experienced this, or something similar?