Unless the Egyptian currency is linked to the dollar, a weaker dollar wouldn't make their food more expensive.
Commodities are priced in dollars world-wide in international trade. So is oil. As the dollar continues to drop in value against non-devaluing assets (which excludes the Euro and Yen which are falling slightly slower), food and energy cost more everywhere. People are not recognizing - yet - what happens when the world’s reserve currency is abused and devalued by America. The real purposes of this action are to enable govt spending (to re-elect politicians) and to save banks. The ostensible purposes are to help the economy grow and to reduce unemployment. Keynesian lies, but clever.
I guess you've never heard of carry trade.
The Egyptian Pound may or may not be formally linked to the US Dollar, but the exchange rate has been roughly 5.5 EGP per USD, plus-or-minus 5% for the last five years.
The exchange rate has been rising recently, meaning it takes more EGP to buy a USD, making it even more difficult to buy dollars to pay for things that are priced in dollars, whose price in dollars is also increasing.