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There really isn't a clear line between "wholesome hearty food" and "crap food". The dosage is the problem and some foods like deserts, candy, and chips are just so calorically dense and so tasty that they're almost assured to be overeaten by the majority of people.
There's another major problem posed by Mars. 96% of the atmosphere is comprised of CO2 and there is only trace amounts of oxygen. That means not only would you have to carry fuel, but you would need to carry your own oxidizer as well which adds a lot of weight.
I would also add that the abstract of RFC 2474 says:
“Differentiated services enhancements to the Internet protocol are intended to enable scalable service discrimination in the Internet”
So my point is that if Apple cared about safety, they'd lock out 3rd party chargers rather than the 3rd party cables. It's the charger that's dangerous when it sends 110V or 220V AC down the USB cable.