How Many Is Too Many?

As of this writing I've had egg, cheese, and spinach on multigrain for breakfast and for lunch I just finished a leftovers sandwich of shredded chicken, some kind of stinky cheese, roasted cherry tomatoes, and arugula also on multigrain. FoSB, I still have most of a loaf of that multigrain to go, and I'm showing no signs of slowing. In keeping with the Sandblog's ethos of rigorous scholarship, I'm asking you: how many sandwiches is too many sandwiches to eat in a day?