[MerelyMortal]

Things I've faced so far: Constipation and Hyponatremia.

Catabolysis and heart damage is also possible. The body will consume fat first, so this is an avoidable outcome. I added the multivitamin and calcium/magnesium/zinc supplement to help avoid damage as well. Damaging my heart is my largest concern with this diet.

[DarylZero]

Losing fat inherently raises blood lipids (the fat has to be circulated), which is bad for the heart long-term, but not an acute danger. The body is evolved to live on body fat, it's fine and normal.