A whole day's food

I like to make breadless "sandwiches" by rolling up fillings of my choice (usually avocado and cheese) in sliced meats (like roast beef). Boiled eggs are good for traveling too. Nuts, seeds, cheese slices, and Tupperware containers filled with "chef" style salads, cooked veggies, stir fries and rice, etc. Leftovers from the night before are great for this purpose. Beef jerky, especially if you make your own without all the additives. Maybe some trail mix. Maybe some dried fruit without sugar added.

Have healthy snacks available so you don't find yourself at the end of the day looking at fast food or vending machines.

I recommend anything you'd take hiking (i.e. google food for hiking). Trail mix, fruit, pita sandwiches, etc. Just try to keep anything that is wet separated from anything else.

For breakfast I always take a wholemeal bagel with peanut butter and honey. It's really filling and keeps me going all morning. You can also google baked oatmeal recipes - it comes out like flapjacks!

For lunch you can take sandwiches if that's what you like. Hard boiled eggs in their shells travel well, and if you eat fish you could take a box with those, some cold boiled potatoes, any veggies you like and a tin of no drain tuna. I carry string cheese and a granola bar.

I agree that thinking of it as six snacks rather than three meals will be helpful, because it's easier to pack smaller snacks when you're on the run. All kinds of salads, with the protein you choose (I like bean salads.) Oatcakes with cheese, ricecakes, you can buy little individual pots of hummus for a single serving. Nuts and dried fruit. Rice pudding (you can get Ambrosia rice pudding in single-serving pots that don't need to be kept in the fridge, they come 4 to a pack.)

There's a gourmet fast food place near me that does California-style burritos - basically wraps filled with rice, beans and whatever other toppings you like - cheese, veggies, you could do tofu. You wrap those up in foil really tight and they'd make a good, filling lunch.

And always carry fruit - apples are really good, satsumas, pears.

Fun question. I've lived like that for long periods of my life. Not so bad.
Breakfast is easy -- and delicious. Put some regular oatmeal in a baggie, with some quantities of dried fruit, flax, etc. Just add hot water in a big mug when you get to work (a 2:1 water/oatmeal ratio is good). Let sit. No need to cook. Viola...instant and *good* breakfast.

I work 14 hr days , 2 days in a row, every 2 weeks. I carry an insulated lunch box, with a frozen ice pack, so I basically carry my own" refrigerator". It will last for the 14 hrs. I can carry and mix / match with:

baby bel light cheese or low fat mozzarella sticks, apple slices, carrot /celery / pepper sticks, grape tomatoes, small holder with ranch or whatever dip or hummus, whole grain crackers, Quakes mini snack cakes for salty crunch, small baggie of almonds, grapes, sliced kiwi, sliced strawberries, blueberries, and Greek yogurts,orange or grapefruit slices, and usually 1 or 2 sandwiches on 100 cal pepperidge farm sandwich thins with plenty of veggies piled on with the 3 oz of deli turkey I prefer, but homemade egg/ or tuna salad, or whatever sandwiches you like will also work. Some days I will take a chef salad with dressing in a small container measured out, or a whole grain pasta salad, leftover homemade healthy veggie chili or some other leftover or something I made and packaged out earlier in week, but I find this can be harder if my day doesn't allow me to have an actual "break". Of course, colder days can take a thermos of a homemade veggie soup/clear soups, etc as well.

I can graze or sit down and eat this way, depending on my day. I always carry PLENTY of water, of course, and you can use, if you like, crystal light sticks, although I don't personally use artificial sweeteners. Hope this gives you some ideas, anyway! Good luck!:drinker: