diet

• Diet (nutrition), the sum of the food consumed by an organism or group
• Dieting, the deliberate selection of food to control body weight or nutrient intake
• Diet food, foods that aid in creating a diet for weight loss or gain
• Healthy diet, the process of helping to maintain or improve overall health

• Diet (assembly), a formal deliberative assembly

• National Diet, Japan's bicameral legislature, in its current form since 1947, composed of the House of Representatives and the House of Councillors
• Landtag, a diet of states and provinces in Germany, Austria, South Tyrol in Italy, and the national parliament of Liechtenstein
• Bundestag (Deutscher Bundestag), the lower house of Germany's Parliament, was established in West Germany in 1949, and all of Germany in 1990

• Diet of Finland, the legislative assembly of the Grand Duchy of Finland from 1809 to 1906
• Diet of Hungary, the legislative assembly of the Kingdom of Hungary from 15th century to 1946
• Imperial Diet (Holy Roman Empire), the imperial assembly of the princes of the Holy Roman Empire until 1806
• Federal Convention (German Confederation), or Confederate Diet (German: Bundesversammlung or Bundestag) was the only central institution of the German Confederation (1815–1848 and 1850–1866)
• Reichstag
• Reichstag (German Empire) (Reichstag), the Diet of the Empire, the legislative assembly of the German Empire, 1871–1917
• Reichstag (Weimar Republic), (Reichstag), the Diet of the Weimar Republic, from 1919 to 1933
• Reichstag (Nazi Germany), (Reichstag), the Diet of Nazi Germany, from 1933 to 1945, a purely ceremonial "parliament" in a totalitarian dictatorship without elections

• "Diet", an episode of the Adult Swim animated television series, Aqua Teen Hunger Force
• The Diet (cartoon), a Beetle Bailey animated short
• "Diet", a 2020 single by Peakboy

• DIET, an open-source middleware for high-performance computing

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• Diets, a historical name for the Dutch language in general
• Dietsch (disambiguation), distinguishes the southern dialects in the Middle Dutch language
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