Hello, Low kidney function ( also called CKD or chronic kidney disease ) means that,the filtering capability of your kidneys might have become low.You must definitely be surprised about it,since you don t have symptoms,and that s why it is called as silent disease. Your doctor must have checked up your creatine levels in blood and albumin levels in your urine.They must be some borderline high and that is the reason,your doctor is wanting to repeat the test in another few months so that kidney functions can be monitored and seen whether they have detiorated any further or not. Any deterioration in kidney function would have to be taken seriously as CKD is a progressive disease which means that it can get worse over time. People with family history of kidney diseases and having high blood pressure and diabetes are called as high risk people. A prompt and early detection can help prevent the progression of kidney disease to kidney failure. Since your triglycerides are high,your doctor has rightly advised you to take aspirin. You must also start doing exercises and avoid consuming beer. Reduce your weight also. As far as food for kidney is concerned,nothing specific is to be done at the moment. Keep your thyroid status in check. Thanks