As a raw material, the quality of lotus leaves has both advantages and disadvantages. For example, the quality of dried lotus leaves sold by most pharmacies is relatively poor. Even if it is Chen Fang's for many years, it is generally only a few yuan to a dozen yuan a catty. The tea market also sells it.
References:
According to ancient and modern medical (food) theories such as Compendium of Materia Medica, Diet Spectrum of Fun Life and China Herbal Tea Formula, lotus plumule and lotus leaf have the functions of clearing away heart-fire, calming liver, purging spleen, lowering lung, clearing away heat, nourishing heart, lowering blood pressure, inducing diuresis, astringing fluid, stopping sweating, stopping bleeding and fixing essence. "Lotus leaf slimming makes people thin and feel inferior." China has regarded lotus leaf as a slimming medicine since ancient times. In hospitals, obese patients are still allowed to drink lotus leaf tea.
References:
Baidu encyclopedia-lotus leaf tea