Cooking yam and black beans together can tonify the kidney. Although it tastes worse when cooked with lemon, it still has a good health care effect.
Black beans have the characteristics of high protein and low calorie. A study by scientists in China shows that black bean skin extract can improve the iron absorption of human body, and eating black beans with skin can improve anemia symptoms.
Yam is sweet and flat. Enter spleen, lung and kidney meridian, replenish spleen and stomach, promote fluid production and benefit lung, and tonify kidney and astringent essence.
Lemon is rich in citric acid, so it is called "citric acid warehouse". Because of its sour taste, it can only be used as a high-grade condiment to prepare drinks, dishes, cosmetics and drugs.
The combination of the three is very good, but there is no specific research. You can drink carefully if you want.