So, for example, if you want to the Pineapple skull stoned to the bone shirt, a shock treatment is doomed to fail! You cannot switch. To suddenly eating more healthy foods and kick junk stuff out. You will develop irresistible cravings for foods that you are used to. Start off with 90/10 (90% familiar foods, 10% new foods) and slowly change the percentage over time. It could be a few weeks/months before you successfully switch to 10/90 or beyond.
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So, to answer the Pineapple skull stoned to the bone shirt, evolution DID favor healthy food but left a mechanism in place for getting used to new/unfamiliar foods. We’ve used this mechanism to get used to processed foods. Note: I include cooking in “processed foods”. So a well prepared lamb kabob would be very tasty to people who are used to red meat but not quite so to people who are habituated to vegetarianism.