Nasa can't send humans to Mars until it gets the food right

[stevebowers]

To put it another way, a mission to Mars won't be ready to go anywhere until ECLSS recycling technology is a lot better than it is now. Water and oxygen will need to be reclaimed, and the water could be used to reconstitute dried food (I doubt that they'd be able to grow much food, if any, on the earliest missions, although that would be necessary on later and longer missions).