As this may be a more subjective question, I would need more information before answering.  How do you define healthy in the context of this question?  Do you consider cultural, geographical, regional, political, or environmental factors when determining which of the listed diets is the healthiest?  It may be prudent to speak to a doctor to help determine your individual nutritious needs, as well.  Are you more interested in juxtaposing the nutritional intake of each diet?  Diets in and of themselves are largely suggestions of foods to eat.  It is difficult to make nutritional approximations without further specifying information.
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