Israel calculated the number of calories Palestinians would need to avoid malnutrition under its blockade of Gaza, according to a study the Israeli Supreme Court forced the government to release.

Release of the document, presented in January 2008, shed new light on the thinking that helped to shape the blockade that Israel tightened in 2007 after Hamas took power in Gaza.

Palestinians describe the restrictions, which drew international criticism and were eased in 2010, as collective punishment stifling their economy.

"It was part of a research paper that came up in two discussions and that we never made use of," Defence Ministry official Guy Inbar said after the document was published by Gisha, an Israeli human rights group that petitioned to receive it.

The study, "Food Consumption in the Gaza Strip - The Red Lines", estimated the required daily calorie intake in the territory at 2,279 per person.

The document said that "in order to maintain the basic fabric of life" in the area, Israel would allow in 106 trucks with food and other essential goods every day. 

Gisha said some 400 trucks delivered goods to Gaza before the blockade.

Last week Israel delivered 935 truckloads of basic goods and construction material to the territory, which has a population of 1.6m.

The calorie calculation was based on a model formulated by Israel's Health Ministry and was largely in line with average Israeli consumption.

According to Britain's National Health Service, the average man needs 2,500 calories to maintain his weight and a woman requires 2,000.

WikiLeaks has published diplomatic cables that showed Israel told US officials in 2008 it would keep Gaza's economy "on the brink of collapse" while avoiding a humanitarian crisis.

To circumvent the blockade, Palestinians have brought in tonnes of goods through smuggling tunnels dug under Gaza's border with Egypt.