Seagan diet is described in this article from Huffington post
The western lifestyle, characterized by growing sedentariness and an increasingly high-calorie diet rich in industrially refined foods and foods of animal origin, and poor in vegetables, legumes and whole grains, contributes to most of the chronic diseases afflicting populations. Western diseases: cardiovascular diseases, diabetes, cancers, degenerative eye diseases (cataracts, glaucoma, retinopathies), steatosis and cirrhosis of the liver, senile dementias, and a number of risk conditions such as abdominal obesity, hypertension, dyslipidemia, osteoporosis, insulin resistance.
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Do not forget the vitamine B12, by eating fish!