This article from
The Economist contains the following claims.
1. "The UN says Israel routinely denies approval for aid convoys. Earlier this month it bombed a food-distribution centre. Israeli forces occupy most of the farmland."
2. "Increasingly there are areas [in Gaza] where local crime families have stolen the little food brought in and are selling it for profit."
3. "Data the IPC has gathered indicate that in February 29% of children under the age of two in northern Gaza were suffering from acute malnutrition. Some 66% of families there went without any food for 24 hours at least ten times last month."
4. "[In Gaza city] only a small handful of supply convoys have been allowed in."
5. "Israel claims its war is to destroy Hamas', not the civilian population, and has denied that it is intentionally starving Gaza. But some senior Israeli politicians have called for exactly that and security officials have admitted that withholding supplies is 'a lever of pressure on Hamas to release Israeli hostages'."
Based on a glance at a few other articles in mainstream publications, this seems typical.
You can choose not to believe the IPC numbers, but either way, the following are well-supported by multiple sources, different forms of evidence, and common sense: (A) there are significant barriers to last-mile distribution, (B) much of the aid is not reaching its intended recipients, (C) some areas of Gaza are in much worse shape than others and (D) Israeli politicians and officials are constantly saying things that indicate that they don't care very much about Gaza's civilians.