Abstract: Obese type 2 diabetes belongs to the category of "consumptive thirst" in traditional Chinese medicine, and obesity is its main cause. This paper summarizes the pathogenesis of obese type 2 diabetes from three aspects: thirst caused by fat evil, deficiency caused by fat evil, and fat evil causing various pathogens. That is to say, the congestion of fat evil produces heat and hurts Yin, leading to consumptive thirst. The accumulation of ointment and fat will damage Yang in the middle energizer and hinder spleen transport. Phlegm and dampness originate from spleen deficiency, which gather in veins and generate blood stasis and heat. The complicated combination of phlegm, blood stasis and heat leads to the relapse or development of consumptive thirst. Based on the theory of "maintaining the sweet and restoring the body fluids", this paper skillfully uses sweet herbs and cooperates with other nature and flavors to treat the pathogenesis of "thirst, deficiency and blood stasis" caused by fat evil injuring body fluids, to achieve the purposes of clearing away heat and nourishing Yin, strengthening spleen and protecting middle energizer, removing turbidity and blood stasis. Finally, the body fluid is continuously produced, transported smoothly, and the consumptive thirst is relieved.