In people with eating disorders: yes, it is dangerous, you do need treatment immediately, if nothing else works as an in-patient to treat this serious starvation problem. read more
Being very underweight, as is the case with a BMI of just 16, could cause a number of health problems. It could cause hair loss or thinning, skin dryness, fertility problems, increased osteoporosis risk or a weakened immune system so you may get sick more often. read more