Generally, one should avoid man-made or man modified foods (e.g. additives, heating excessively etc) otherwise known as processed. And the OP has the right idea if Jesus ate it, it's OK. (modern breads, salt, and the like have been altered although in their natural form are very healthy). That's what I go by; if the Bible allows it and/or is Kosher, then it's healthy. Pragmatically speaking, things that are in boxes, cans or wrapped in some way are processed food. Foods in their natural forms are what we should be eating. In a supermarket, the natural foods tend to be on the perimeter: meats, butter, diary, produce, nuts and the like which are all generally healthy (I have issues with milk due to the previously mentioned heating: it gets somewhat modified from just milking a cow. OK,OK we may have a container for containment such as our eggs and yogurt. You don't want to scrape the yogurt off a shelf. LOL