Canned food might include many preservatives, additives, flavors, colorings. Most are not natural products. Rather artificial. I am talking about the Eeeee's family.
I am not sure if there are any studies in this regard. But there are warnings about additives. Check the ingredients and do some research about the E-family. Here is a link to start with http://www.ukfoodguide.net/enumeric.htm

In my opinion. A nice presentation has nothing to do with the way you prepare food. For example salad is usually a cocktail of vegetables, possibly some fruits, possibly cheese and ham. You can simply mamage a nice decoration for the top part and forget about the lower part.

If you watch how Jamie Oliver prepares the food, you will be amazed. In no time he can prepare food and arrange a table with a nice variety and it looks yummy
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