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Notions of what constitutes a healthful diet vary with geography and custom as well as with changing times and an evolving understanding of nutrition. In the past, people had to live almost entirely on food that was locally produced. With industrialization and globalization, however, food can now be transported over long distances. Researchers must be careful in making generalizations about a national diet from a relatively small sample of the population; the poor cannot afford to eat the same diet as the rich, and many countries have large immigrant groups with their own distinctive food patterns. Even within a culture, ...(100 of 13487 words)