Processed foods are physically or chemically altered to make them easier to store or transport, or simply to increase their value. Some of these processes do not impact nutrition, like homogenization of milk. Some substantially impact nutrition, like removing the germ and seed coat from wheat in flour production.
Healthy food can be cheap, but you won’t hear much about it because everyone is trying to maximize profits by pushing expensive foods. You will never see a commercial for dried beans, nor a tv show explaining how to prepare them.
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