What? You don't think this is an issue because your McDonald's diet doesn't require fruits and vegetables? You need more than calories but also a thing called nutrients. That's your standard for a quality life? Well, I am not staving to death...
Without looking for veggies that don't need pollinators, in a pinch, sprout your grain, although that won't take care of your Vitamin C requirement. Better, as some POWs held by the Japanese in WWII did, use a bacteria or mold to convert the starch to sugar, then culture yeast in that. By the end of the war, they were healthier than their guards.