Final answer:
The increase in overweight individuals in Japan due to Westernized diets illustrates an example of an unplanned change, resulting from broader social and economic trends rather than deliberate policy efforts.
Step-by-step explanation:
The Westernized diet causing many Japanese to become overweight is an example of unplanned change. Unplanned changes are those that occur without a specific intention or policy driving them. They can be the result of various factors such as global trade, cultural exchanges, or the spread of information and lifestyles through media and travel. In the context of dietary change, the shift toward a Westernized diet in Japan leading to an increase in obesity rates has occurred without deliberate efforts by the government or organizations to encourage this specific diet, making it an unintended consequence of broader social and economic trends. Lifestyle changes due to these kinds of dietary shifts often arise from consumer choices and are usually remediated by a change in diet that's influenced by new dietary trends focused on eating healthy and adopting more active lifestyles.