If you shop with easy meal prep in mind, you can eat very decently without actually working much, especially if you’re willing to pay a little extra to let the supermarket do some of the work for you (eg buy a rotisserie chicken, rather than roasting your own.) A few suggestions for meals and snacks are below. None of these should take more than about 4 minutes of prep time, excluding boiling the water for some of them, and they’re all reasonably healthy. None require any chopping, or any cooking skills beyond use of the microwave or ability to boil water:
Boil a dozen eggs at the beginning of the week, and eat 1-2 with a salad for lunch (below). Place in a pot with cold water to cover, bring just to a boil, cover pot, remove from heat, and let eggs sit in hot water for eight minutes. Remove from water. Put back in their container in the fridge and eat as needed.
Salad: buy a bag of prewashed lettuce, baby spinach, or prechopped cole slaw or broccoli slaw. Toss with bought salad dressing and a handful of nuts (optional) or anything else that seems like it’d be appealing in a salad.
Buy snow peas, baby carrots, celery, grape tomatoes, and other vegetables that require no peeling/cutting (you might want to rinse them first), and eat with hummus or other healthy, buyable dip.
Buy a box of not-too-sugary cereal. Add milk.
Buy a rotisserie chicken from the supermarket. This easily covers the protein for 4-5 lunches for one person.
Buy decent frozen veggies (the IQF ones, not the ones that come as a frozen block in a box.) Follow the package directions for microwave preparation. Season with any of: butter/soy sauce/bought salad dressing/anything other sauce that seems appealing. (Microwaved green peas, tossed with salt and toasted sesame oil, are delicious.) Eat next to your chicken. You can make and season one bag of veggies at the beginning of the week, then scoop a serving into a container each morning.
Eat lots of fruit. Most of it requires no prep other than washing.
Buy tortillas, a can of spiced refried beans, some shredded cheese, and bag-o-salad. Make wraps. You can add bits from your rotisserie chicken if you like.
Buy a container of chopped-up fruit at the supermarket. Mix with cottage cheese.
Poke a few holes with a fork in a potato or sweet potato, wrap in a paper towel, and microwave until soft, 4-6 minutes. Slice in half, and top with your preferred baked potato toppings, or just a sprinkling of salt.
Plain yogurt, with a dollop of jam/handful of nuts/some defrosted frozen fruit/a few spoonfuls of granola/nothing at all. Or flavored yogurts, if you don’t mind all the sugar (they’re amazingly sugary if you check the nutritional info.)
Boxed soups, like these, can be very good and require only microwaving.
String cheese, cheese slices, or your preferred type of cheese.
Canned tuna or salmon. Eat as is, or make into sandwiches, or wraps with tortillas and greens from your bag-o-salad.
Instant oatmeal. Or regular oatmeal (take 1/2 cup oats, 1 cup water, place in bowl, microwave for two minutes; season as desired - I like honey and raisins.)
Nuts - peanuts, almonds, pecans, cashews, whatever. Don’t go crazy on these if you’re watching your weight, but if you have to remind yourself to eat, I wouldn’t think that’d be your problem.
Dried fruit.