On his Twitter. Manny is one hungry dude. Dan Rafael @danrafaelespn · 12m 12 minutes ago I'm in Manny's dressing room. He has arrived for weigh in and is eating a meal BEFORE weighing in. Seriously.
Of course its because he doesn't want to pass out from all the blood thats getting drained from him lol
The blood-testing will not hinder his performance at all. He agreed to even be tested "the day of the fight" - Manny has this covered I'm sure.
It probably wouldn't take that much effort from him to go back down to 135lbs as he basically bulked up to make welter.