Superskinny. I used to be; I used to weigh 5st 4 at 5'5 (BMI 12.2), yes, I have an eating disorder
. I'm weight-restored now to 8st 1 (BMI 18.9) so I'm still hardly large
but I've found being this 'heavy' hard to tolerate. I really don't think I'd cope being genuinely overweight let alone obese
.
+s and -s of each -
Superskinnies aren't looked down on in the same way as supersizers - supersizers are perceived as lazy, slobbish, no self-discipline etc. etc. When I was at my lightest, I got stares and shocked people etc. but although I got -ve attention ('just eat a ****ing sandwich' - oh, how original!) I had more people concerned for me and my health and how I was feeling, rather than ridicule.
Health-wise it depends on how extreme the weights are on both ends. Everyone knows the risks of being overweight - although, people with a BMI 25-28 are meant to live longer than those of 18.5-25! Being underweight has its own risks though (although I've been very lucky) - being grossly underweight means very likely to not have periods and therefore develop osteoporosis (having hip replacements in 20s is not cool...), causes muscle wastage including cardiac muscle (which is never replaced), causes organ failure, screws up cognitive functioning and causes poor perceptions and irrational thoughts... A low caloric intake means crap concentration, decreased cognitive functioning, poor circulation, always being cold, having no energy, low blood pressure, low heart rate (both of which combine to cause fainting, as does low blood sugar)... Both the low intake and the low weight increase other risk factors - for example, at lower weights my blood chemistry was always off, and my stomach is extremely badly damaged and has been unable to repair itself despite being 'healthy' for 5 months and a LOT of medication.