Hello!
What helps me the most is keeping my eating style simple and preparing my food in advance.
On the weekend, I cook a pot of beans, put it in a big bowl, and mix the beans with two 1-lb bags of frozen corn. Sometimes I add cooked oats too (whole oat groats, not oatmeal). You could use rice. I'll flavor the beans and grain with some sauce and then divide the whole thing up into seven servings in plastic tubs.
I cook a bunch of sweet potatos and put each one in another plastic tub.
Then for lunch each day at work, I'll take a bean tub, a sweet potato tub, an apple, a plum, and a white potato.
Getting lunch ready in the morning is a snap -- takes about two minutes to throw the tubs, fruit, and potato in my lunch bag.
For supper, I'll have a 1-lb bag of brocolli and another sweet potato.
For breakfast, I typically have whole oats and frozen blueberries.
Very simple, very little preparation, especially when I'm hungry and want to eat ten minutes ago.