Researchers in the Netherlands have been attempting to grow crops in soils created to simulate conditions on the Red Planet and also the Moon.

Scientists of Wageningen University & Research Centre, Wageningen , were concerned that even if food grew it would contain dangerous levels of metals which would be toxic to humans.

But experiments growing tomatoes, peas, radishes and rye proved that the crops were not only safe, but possibly healthier than those grown in Earth soil.

“For radish, pea, rye and tomato we did a preliminary analysis and the results are very promising,” says Dr Wieger Wamelink. “We can eat them.”

http://www.telegraph.co.uk/science/2016/06/27/tomatoes-grown-in-martian-soil-for-first-time/