Admittedly, not my best. Had to settle for a not-as-good camera. Anyway...I just had to take a photo of my little Mycroft after he'd finished with his cake. Yep. A VERY happy, plump and content Mycroft. So much for the diet...!
"In the novels, Mycroft has always been shown as being quite chubby because on his case he does not really do a lot of ‘legwork’. Gatiss decided to make the twist that Mycroft is trying to go on a diet but is struggling. And as cake is impossible to resist, i guess the fandom put the two together."