(Trigger warning, Sherlock suffers from Anorexia.)
John was used to it, for the most part. It was probably incredibly unhealthy but Sherlock refused to eat anyway. Going days without a single speck of food, maybe a cup of tea, here and there. Except lately, John had noticed something. He snuck up on Sherlock to only see him standing in his bedroom, in front of a mirror, pinching skin on his waist and frowning. John gasped silently. Was all of this, starving, not because of "digestion slows me down", but because Sherlock was unhappy with his body? What he was pinching, it wasn't even fat, it was actual skin. John silently crept back in