As millions of Americans are about to go hungry due to the US government refusing to fund SNAP, just remember that only two countries voted against making food a basic human right. The US and the terrorist colony of Israel
Shy of magic, that’s not a policy you can implement. Either people in a region have access to food or they don’t. You can’t just put a stamp on a loaf of bread that makes it inedible to anyone carrying a gun.
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Again - I believe Albert was specifically talking about denying food from the soldiers of the invading enemy army.
Unless the enemy is in there long enough to start farming your land, their only have two options to get food - they can bring it from their home country (or some other country they control, or one that's friendly enough to sell it to them) or they can try to get it from your country. You can sabotage their first option by attacking their supply lines, and as for the second option - hopefully your own citizens won't give them food, either because they don't want to be invaded or because they are afraid of their own government. Or both. Either way, you'll have to protect them, of course, because the invading army may try to steal food from them.
Even if you do everything right you probably won't be able to hermetically block their food supply - but you may be able to dwindle it enough to starve them. It takes a lot of food to feed an army.
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Regardless - never underestimate the human ingenuity when it comes to inflicting harm on other human beings.