>>370
インスリン単独ではないようですね
ドーパミンやグルカゴンも絡んでいると考えられているようです

Health Risks of the Ketogenic Diet
http://fellrnr.com/wiki/Health_Risks_of_the_Ketogenic_Diet
2 Health Risks > 2.2 Sodium Loss and Hypotension
Low carbohydrate diets cause of the kidneys to excrete more sodium.
This is known as "natriuresis of starvation", and may be due to low insulin[4], increased dopamine excretion[5], or elevated Glucagon[6].
If carbohydrate and sodium intakes are both limited, then the body will secrete the hormone aldosterone[7] which will cause the kidneys to excrete potassium and conserve sodium[8].
This loss of potassium can cause Muscle Cramps and heart arrhythmias, as well has the loss of Muscle Tissue.

古い論文ですがこちらもどうぞ

The Mechanism of the Natriuresis of Fasting
https://www.jci.org/articles/view/107941/version/1/pdf/render