Never heard that about rice. I never put rice I cook in the fridge, it stays in the rice pot. I've never gotten sick from it, but it's something I grew up with so that may have something to do with it. I've eaten street food in Mexico, Central America, and Asia and never gotten sick. I do make sure anything I eat in a foreign land is thoroughly cooked and I never drink the water and I avoid ice cubes. I've never gotten sick from food while traveling but just about anytime I eat fast food I feel like crap.
I don't like leftovers so I try to cook simple meals in a small enough portion to just feed myself one meal.