Simple ways to lose weight naturally

I was searching for more information on Cumin Coriander and Fennel tea which my sister had told me a GI doc who came on Dr. Oz recommended to her patients for GI issues, then they found they also lost weight on it. I found this video on youtube. It doesn't give much info on the tea, it just mentions it, but i think the channel has stuff on weight loss. You can check it out if you want.