Well said Entwisi

People forget about their own bone structure, im a medium & i used to attempt to shove it in a size 10 body no wonder i was portruding bones i am not nor should be a size 10 or even a 12 is a bit ropey for me ribbys show whearas 14 is perfect with meat covering me bones & im in within my BMI index. Boots used have a good weighing scales that actually u put in height, gender & build size [med, small large] & then calculated your weight for you & at what you should be - i think thats great cos it took into consideration of body frame which gives a more acurrate figure
Since being at the right frame for me i've not suffered illness as much & fought off that flu rather quickly than a few years back it used to put me on my arse for a month a time all because i wasn't insulating myself as much as i should therefore not protecting my body & making it over work to fight it off, my son has the same problem cos he is a lil under weight struggling to put it on but gets prone to colds more & virals, whereas my daughter no prob she's right frame & weight etc rarely ill - so i suppose thats how we know when we are right or not LOL.