you guys can shoot me for writing on this thread but there's an article in the NYTIMES right now that i found very profound; here's two excerpts:

http://www.nytimes.com/2009/08/02/ma...tml?ref=dining

Consider some recent research on the links between cooking and dietary health. A 2003 study by a group of Harvard economists led by David Cutler found that the rise of food preparation outside the home could explain most of the increase in obesity in America. Mass production has driven down the cost of many foods, not only in terms of price but also in the amount of time required to obtain them. The French fry did not become the most popular “vegetable” in America until industry relieved us of the considerable effort needed to prepare French fries ourselves. Similarly, the mass production of cream-filled cakes, fried chicken wings and taquitos, exotically flavored chips or cheesy puffs of refined flour, has transformed all these hard-to-make-at-home foods into the sort of everyday fare you can pick up at the gas station on a whim and for less than a dollar. The fact that we no longer have to plan or even wait to enjoy these items, as we would if we were making them ourselves, makes us that much more likely to indulge impulsively.

Cutler and his colleagues demonstrate that as the “time cost” of food preparation has fallen, calorie consumption has gone up, particularly consumption of the sort of snack and convenience foods that are typically cooked outside the home. They found that when we don’t have to cook meals, we eat more of them: as the amount of time Americans spend cooking has dropped by about half, the number of meals Americans eat in a day has climbed; since 1977, we’ve added approximately half a meal to our daily intake.
Cutler and his colleagues also surveyed cooking patterns across several cultures and found that obesity rates are inversely correlated with the amount of time spent on food preparation. The more time a nation devotes to food preparation at home, the lower its rate of obesity. In fact, the amount of time spent cooking predicts obesity rates more reliably than female participation in the labor force or income. Other research supports the idea that cooking is a better predictor of a healthful diet than social class: a 1992 study in The Journal of the American Dietetic Association found that poor women who routinely cooked were more likely to eat a more healthful diet than well-to-do women who did not.

“Easy. You want Americans to eat less? I have the diet for you. It’s short, and it’s simple. Here’s my diet plan: Cook it yourself. That’s it. Eat anything you want — just as long as you’re willing to cook it yourself.”