There are very few herbal diet pills that can claim to have no side-effects - a good example of a "side-effect free" weight loss pill is Hoodia. And what is this "green vegetation" in these pills? Until you know more about what you are taking, and the possible side-effects it may cause, I would strongly caution you about taking these diet pills.
I had no special feeling except for thirsty and poor appetite. I ate a lot of noodles in the morning but ate quite late and quite a few of porridge at noon as I didn't feel so hungry at all. For supper, I had pettitoes, cabbage and a few rice and a bottle of yoghourt four hours later at around 9pm when I got back home from university.