1. Fact is, in your teens and early 20s your body can digest pretty much anything. Eat a bowl of cereal in the morning (and I mean something like oatmeal or raisin bran rather than some sugary crap) and it barely matters what else you eat (other than calorific content);
2. Eating the same thing every day gets real old real fast;
3. There is an investment required in cooking in terms of equipment, etc;
4. Cooking takes time between shopping, cleaning and the actual cooking. That's time that could be better spent doing many other things.
5. Even getting something for lunch can be a huge time sink and minimally takes half an hour unless you're eating out of a hot dog stand right outside your office.
This is why I'm a huge fan of companies providing a cafeteria or some find of catered meals. Of course, this requires both being a certain size and obviously costs money but, I would argue, the cost is well worth it in terms of:
- variety of meals - not needing to shop, cook or clean - time saved in not going out for lunch and other transit - time that can be spent talking over work-related stuff while eating with your colleagues - other intangible benefits such as the team-building aspects of socializing with your colleagues
These benefits are so huge I think that it'd be worth having everyone chip in to pay for something like this and would probably be an economic form of eating.
Now I'm lucky enough to work somewhere that has almost legendary catered meals (Google), which must cost them a fortune (eg dinner was steamed mussels, beef stroganoff, garlic whipped potatoes, green beans, steamed broccoli and a pineapple and blueberry salad, and that's just what I had) but IMHO they make their money back in terms of employee satisfaction and saved time on all of the above things.
Fact is I have more variety of food than I'd ever cook myself (or probably even buy).
That of course is a cafeteria type situation. Like I said, on a smaller scale, catered meals are a cost-effective doing this on a smaller scale. Your best bet would probably be to hire a cook rather than outsourcing the entire process (eg someone in or just out of culinary school).