Whats the difference between these two, is food security secure access to any food, while nutritional security is access to the food necessary to meet all nutritional needs?
Isn't nutrition security kind of implied? Like, is there someone who's like giving away 2200 calories a day in twinkies and ho-hos being like "aha! Gotcha! You just said 'food' not 'healthy food!'" like some sort of lawful evil djinni? The movement to combat food deserts is to get actual grocery stores so that people have access to fresh fruits/vegetables instead of just the processed food available at dollar stores.
OP just wants to embrace semantics to try to feel superior. Just like everywhere else in their life, we're all just rolling our eyes and wishing to the heavens they would shut up.
In the original phrase, the word used was not "cake", it was "brioche", which is a kind of French toast. And the thing is you still need bread to make brioche.
The phrase often but wrongly attributed to Marie Antoinette, alludes to the ignorance of everyday matters from the ruling class that are too rich to even know how to tie their own shoes.