It is useless for walnut shells not to soak in water. I'll give you a way. Let's call it "walnut drink". Taking walnut leaves and decocting them has the function of lowering blood sugar, which is suitable for elderly diabetic patients. "Walnut Drink" is used to treat diabetes: use 12 walnuts every day, break the shell to get meat, split the hard shell wood (that is, the partition wood separating walnut kernels) and add water to walnut kernels. Remove the hard shell and proper wood, and divide the liquid medicine and pulp into three parts, one half an hour before meals, three times a day, 30 days as a course of treatment, and then check once a month. If blood sugar and blood lipid are normal, the maintenance amount can be 4 walnuts a day, as above. Can be taken continuously for a long time.