 [ Symptoms ] what increases the risk of getting cystic fibrosis [ Disease ] most helpful answer bananas are high in potassium so your lab tests or your medications may indicate a need for this some additional potassium or your doctor owns stock in dole banana company an apple a day keeps the doctor a way but a banana has more potassium i do not see an obvious relationship between eating bananas and low vitamin k levels not knowing the test results i would say the banana recommendation would be to increase potassium but to increase vitamin k levels you would want to look at leavy greens if it is low potassium level then various fruits and vegetables plus low fatfat free dairy product can supply this eating a salad daily with leafy greens as a way of getting your veggies should take care of your vitamin k david rath ma rd ld registered dietitian david rath nutrition inc because they think your potassium is low and this will help