Why do African Americans usually have bad dietary habits?

In almost every African American gathering I've attended over the years (I have black friends), the food served are lacking in healthy food. My next door apartment neighbor (who is 3/4 African American and married to a white woman) absolutely hates fresh meat, vegetables and fruits, preferring instead to eat only processed or pre-cooked meats. Sometimes I think he's simply just lazy to cook.
Why do African Americans usually have bad dietary habits?
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