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  1. (countable & uncountable) A diet is the food that an animal, a person, or a group usually eats.
    Several studies have suggested that high-fat diets can directly increase the risk of this cancer.
    Studies confirm that vegetarian is a healthful and balanced diet."
    I exercise, watch my diet and have good genes.
    A healthy diet should not exceed 30 percent fat per day.
    He was unhealthy thanks to poor diet and heavy smoking.
  2. (countable) A diet is a controlled set of foods chosen for health purposes.
    Oprah Winfrey wasn't the only celebrity who transformed her body through exercise and diet last year.
    He said he lost weight because of his new vegetarian diet.
    It's strange to see somebody at a movie buy jumbo popcorn and a huge diet coke.
    They demand that you start getting serious about both proper exercise and diet.
    She stuck to the strict diet for the first two weeks and her blood pressure came down.
  3. (countable) A diet of something is something your experience regularly, usually something negative.
    The Daily News has served up a steady diet of local news.
  4. (countable) A diet is a council of political leaders.
    This week, the Japanese parliament, the Diet, considered but did not act on a resolution apologizing for Pearl Harbor.


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  1. (intransitive) If you diet, you limit the food you eat to lose weight.
    Weight lost by dieting alone almost never stays off.