We don’t usually. We could engineer (and many have tried) to make a food that contains all the nutrients we need, but people tend to get sick of eating the same thing every day. I mean, would you eat the same thing every day for your entire life?
People want variety and if you want variety you have to take some care about balance. This is not that big of a problem, but because people are also creatures of habit, they might orbit around the same few food items, which in turn might result in an imbalanced diet.
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