In a nutshell, food prices are rising due to increasing costs in taking raw ingredients from the ground and converting them into the groceries that you can purchase at your local supermarket.
Food prices throughout the world have gone up sharply and Oxfam has already given the world the warning that this trend will grow over the next two decades.

Floods have hit farmland in countries like Australia, which is a world exporter of wheat and sugar cane around the world.

February 2011 saw the monthly wholesale cost of food at the highest recorded level yet, as per the UN Food and Agriculture Organization’s figures (FAO).
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Compare Supermarket Prices in Kenya | BeiYangu