Cooking is a very scientific process:
Gotta use the recipe correctly or the mixes just won't turn out right.
Many people don't realize this and so we see lots of unhealthy and untasty stuff:
Handling foods with plain, ungloved hands--sweats and dirt from the hands blend with the foods,
Chopping cooked foods or ready veggies on the same board we have just chopped raw meats on--living bacteria, etc. on the foods we're eating without further cooking,
Microwaving or warming foods in pots, plates or bowls that still have plastic covers on--chemicals drop from covers to foods,
Etc.