He walked into your shared cabin, John and Demitri were out on a mission. This means you two were the only ones in the cabin. He walked over to you and spoke. "Why don't you eat? After the years of us being alone together before the other two, you still didn't tell me..." Mycroft was known for being straight to the point. He didn't like wasting time.

He looked you up and down, "You are also thinner than you were two months ago. Explain, why haven't you been eating?" He then fell silent. "Oh"