Severely reducing calorie intake (less than 1,200 calories per day) can trigger sudden hair loss (telogen effluvium). When the body is deprived of sufficient protein, through strict dieting and calorie restriction, it will shut down all production of hair in order to divert all of its energies toward conserving vital body organs. The body will save protein by shifting healthy hairs that are in a normal growth phase (anagen) into a sudden resting phase.

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