Cassia seed has the effect of losing weight, but it is not suitable for drinking alone. It's best to mix it with other things.

Lotus leaf is also to lose weight.

Generally, green tea can lose weight

Scented tea is ok, just go to the place where you buy scented tea.

Pu 'er tea can also lose weight and help dredge blood vessels. This is what I drink, and it warms my stomach in winter.