Hye, thanks for your query.
First of all no food will work in isolation in weight/fat loss.
It's a balanced diet that is important to fat loss. Remedies like green tea don't help weight loss. They help flush out your system and act as a detox which definitely will help better digestion and metabolism.
This will aid in your efforts that you are trying to follow to lose weight.
So, try to go for real organic green tea. You can make herbal teas at home as well, by using lemon grass, mint, ginger, chamomile, jasmine etc.
Most green teas available in tea bags don't benefit as well.