Yes, according to macrobiotics, dark hollows under eyes can be a result of kidney damage by excessive salt, animal fat or protein. If you have no deep dark circles, but eye bags, your kidney could be overwhelmed by excessive intake of alcohol, sugar, sugary fruits, liquids. You can read about this in books of chinese diagnostics and macrobiotics - e.g. Pocket Guide to Macrobiotics by Carl Ferre. Try to avoid these dangerous foods (salt, animal foods, especially dairy, heavy fat) for some time. The best way is to eat only rice (without salt! Only rice) some time (9 days recommended), then slowly add other foods - vegetables, fruit, vegetable oils, legumes, then other - and observe your reactions to these foods... You should also observe the amount, frequency and color of your urination in the same time. Write a diary to find out if there is something toxic in your diet. Tip: Salt and animal foods are the most suspect, but there are other potential kidney-toxic foods: Nightshades (potatoes, tomatoes, peppers), spinach, rhubarb, chocolate, teas, nuts (high oxalate content), breads. Consult a chinese doctor and a good western nephrologist.