Ouch! I know this is a favourite for both health enthusiasts and peanuts lovers in general. Its list of nutritional benefits is also long. But peanuts can be bad news at times as well, especially for those with a weakly functioning kidney. Peanuts have oxalates – stuff which kidney stones are made up of. Not all stones though. But, calcium oxalate kidney stones are, by and large, very common, as per the reports of the National Kidney Foundation. And, in case, you had a kidney stone of the same type in the past, you must avoid these legume crops at all costs! And, yes, moderate consumption is recommended for those who believe their renal health is okay.