Inadequate potassium intake

Inadequate dietary intake alone is a rare cause of hypokalaemia since kidneys decrease the amount of potassium excretion, allowing for nearly 2-3 weeks of total potassium depletion before normal serum levels would be expected to decrease (1). In hospitalised patients, it may be a contributing factor for hypokalaemia (2)

However, hypokalaemia from other causes may be exacerbated by low potassium intake. Severe hypokalaemia is seen when poor potassium intake is combined with increased losses - e.g., in alcoholic patients or severely malnourished patients (1).

Inadequate intake may be present in:

• anorexia
• dementia
• starvation
• total parenteral nutrition (2)

References:

1. Kim MJ, Valerio C, Knobloch GK. Potassium Disorders: Hypokalemia and Hyperkalemia. Am Fam Physician. 2023 Jan;107(1):59-70.
2. Kardalas E, Paschou SA, Anagnostis P, Muscogiuri G, Siasos G, Vryonidou A. Hypokalemia: a clinical update. Endocr Connect. 2018 Apr;7(4):R135-R146. doi: 10.1530/EC-18-0109.