Yeah, echoing what other posters have said--if you are restricting calories as part of your diet, be careful not to under-eat, eating fewer calories than your body requires to maintain itself at the most basic level. The majority of the calories we eat go towards just keeping us alive.
As a very rough guideline, you can calculate your "basal metabolic rate" (which is the amount of calories your body would need if you were literally immobile the entire day)... obviously this is just an estimation. But for instance, according to this calculator, based on my height, age, weight and sex, if I were eating less than 1354 calories a day, I'd actually be starving myself. Obviously that's not good for a person in general, including the hair! Good luck.
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