US President Donald Trump said many people were starving in Gaza and suggested Israel could do more on humanitarian access, as Palestinians struggled to feed their children following Israel's declaration of steps to improve supplies.

Trump's assessment put him at odds with Israeli Prime Minister Benjamin Netanyahu, who said on July 27, "There is no starvation in Gaza" and vowed to fight on against Hamas, Reuters reported.

Speaking during a visit to Scotland, Trump said Israel has significant responsibility for aid flows and that many lives could be saved. "You have a lot of starving people," he said.

Trump announced plans to establish food centres "with no fences or boundaries to ease access" and said the US would work with other countries to provide more humanitarian assistance to Gaza, including food and sanitation.

The Gaza health ministry said at least 14 people had died in the past 24 hours from starvation and malnutrition, bringing the war's death toll from hunger to 147, including 88 children, most in recent weeks.

Israel announced several measures over the weekend, including daily humanitarian pauses to fighting in three areas of Gaza, new safe corridors for aid convoys, and airdrops. The decision followed the collapse of ceasefire talks earlier last week.

Wessal Nabil from Beit Lahiya in northern Gaza described the struggle to feed her three children. "When you go to bed hungry, you wake up hungry. We distract them with anything ... to calm them down," she told the US agency.

The World Food Programme said 60 aid trucks had been dispatched, short of its daily target of 100 trucks. Almost 470,000 people in Gaza are enduring famine-like conditions, with 90,000 women and children needing specialist nutrition treatments.

Two Israeli defence officials said international pressure prompted the new Israeli measures, alongside worsening conditions on the ground.

Jan Egeland, head of the Norwegian Refugee Council, said the situation is catastrophic. "At this time, children are dying every single day from starvation, from preventable disease. So time has run out."

The WFP said it has 170,000 metric tonnes of food in the region, outside Gaza, which would be enough to feed the whole population for three months if it receives clearance to bring it into the enclave.

COGAT said more than 120 truckloads of aid were distributed in Gaza on Sunday by the UN and international organisations.