It would depend on various factors and would vary greatly between individuals
For a 75kg person, that means 90-150g protein daily spread across all meals
It is also a problem for muscle
Warning signs include persistent right upper quadrant abdominal pain, jaundice (yellowing of skin or eyes), dark urine, pale stools, or unexplained fatigue
Over time, this energy shortfall sets off a cascade of downstream effects: synaptic dysfunction, impaired protein clearance, neuroinflammation, and ultimately the accumulation of amyloid- and tau pathology Importantly, imaging and metabolic studies consistently show that reductions in cerebral glucose metabolism and perfusion precede cognitive symptoms by years, often decades [8]
In many cases, menstrual cycles return once the body adjusts to the new weight or the weight loss slows down