2. Black beans contain a lot of cellulose, which can also regulate blood lipid and lower blood sugar, and are suitable for patients with hyperlipidemia and diabetes to drink for a long time. Because the potassium, magnesium and calcium contained in black beans have the functions of protecting cardiovascular system, supplementing myocardial nutrition, lowering cholesterol, promoting blood circulation and preventing vasospasm, it is suitable for people with coronary atherosclerosis to drink.