“Tom's friends and family have urged him to take a break, but he has brushed off their concern,” a “source” told Grazia (via the Daily Mail). “He is refusing to slow down and is trying to soldier on. He doesn't seem to be himself. He hasn't been working out like he normally does and doesn't appear to be eating well at all. His clothes just hang off him.”
It’s possible the weight loss had nothing at all to do with Katie and was just related to ending one film (Oblivion) and starting another (All You Need Is Kill). Plenty of actors bulk up for a movie and then slim down when it’s over. Or do you think stress is the source?