The problem with junk food is not just that it is lacking in essential nutrients. If that were the only problem, then Snickers bars and multivitamin supplements would be a healthy diet.<p>Junk food is unhealthy for a myriad of reasons, including the heavy use of sugars. Humans were not evolved to subsist on sugar and oil (and various corn-derived products), but that is a huge chunk of junk foods.<p>It is possible to eat fairly cheaply and still healthily, but it is not as cheap as eating unhealthily. It&#x27;s also far more time consuming because cheaper healthy foods are uncooked and unprocessed, whereas cheaper unhealthy food are generally ready to eat.