Even if it were true that Israel delivers enough for 1.7 million mouths (and there is no indication that it is), if the population, due to Israeli action, hasn't the means to buy it that's hardly a defence of those actions.
They can import as much food as they like without restriction.
Gaza and Egypt have always had poverty which is worse in Gaza because Hamas has dragged them into a never ending war.

FACT! Israel has bombed Gaza back to mediaeval status and beyond.Every picture that comes out of Gazqa is a picture of smashed dwellings, factories and infrastructure
It is a fact about the pictures, because pictures of undamaged buildings are not news.
Gaza is enjoying economic growth levels that we can only dream of.
In 2011 the Gaza Strip enjoyed a 27% growth rate compared to 2010. This growth contributed to a rise of about 23% in the per capita GDP. The growth is mainly the result of a significant acceleration in building activity in the Gaza Strip, due to Israel's easing the restrictions on bringing in building materials (for international projects under the supervision of the PA and the international community) and to the smuggling of building supplies via the tunnels. In the first quarter of 2012, the Gaza Strip showed 6% growth compared to the first quarter of the previous year.

The unemployment rate in 2011 dropped to 29% (the lowest in a decade), compared to 37.8% in 2010.