Mars would be amazing challenges, there are many reasons. In addition to the risk of abnormalities, as well as cosmic rays from the fuel problem, micro-meteorites and mild spirit because a long time locked up in a very small space generated. Spacecraft to reach Mars and return must carry sufficient fuel required. And the spacecraft must carry enough fuel in the ship staff - food.
If you consider the nutritional demand of ordinary men, then he needs a daily intake of calories and amount of the following nutrients:
2,500 Calories
83 g fat
60 grams protein
25 g fiber
Vitamins and minerals
We can assume that (mixed with food or as tablets) vitamin and mineral food supplements, there is no need to worry about this part of the equation. All question boils down to calories, protein, fat and fiber.
If you are in to food is minimalist, you can get the calories from sugar, get fat from vegetable oils to get protein from protein powder to get fiber from wheat bran. In this way, everyone involved in this year's tour will need:
274 kg of sugar
60 kg of vegetable oil
43 kg protein
18 kg fiber
If all of these ingredients make bars or coarse ground, everyone will need about 400 kg of food. Grocery store dog food, usually large bags loaded 9 kg. So you need 44 bags (the size of a large dog food bags) of food needed to sustain life a man for two years. These foods are loaded just about the size of 1.5 m 1.5 m 1.5 m cube.
Most people want a little change in the type of food, so the food must be at least sounds very interesting. Due to packaging reasons, it may slightly increase the size, but the weight of the food will be the same.
Another nutrients people need is water. In most of the space flight mission, the water is a byproduct of the fuel cell power generation, so it's not a big problem. As for drinking water, a person needs about 1,500 liters in the two-year mission. Water footprint about the same food.
(The answer from finishing HowStuffWorks)
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