ダイエット

• Reading: ダイエット
• Romaji: daietto
• Kanji breakdown: From English 'diet' → katakana adaptation ダイエット (meaning narrowed to weight loss in Japanese)
• Pronunciation: /da.i.et.to/

Meaning

Diet; losing weight through food restriction, exercise, or lifestyle changes.

In Japanese, ダイエット almost exclusively means 'losing weight' or 'going on a diet,' unlike English where 'diet' can neutrally refer to one's regular eating habits. It's one of the most ubiquitous health and beauty terms, appearing constantly in magazines, TV shows, and social media. Japan has a massive diet industry with new trends appearing every season — from specific food diets to exercise methods.

Examples

1. 夏までにダイエットしなきゃ、水着着れない。 I have to go on a diet before summer or I won't be able to wear a swimsuit.
2. ダイエット中だけど、このケーキだけは食べていい？ I'm on a diet, but can I just have this one cake?
3. 今年こそダイエット成功させるって毎年言ってる。 I say 'this is the year I succeed at dieting' every single year.

Usage Guide

Context: daily conversation, social media, beauty, health

Tone: casual, determined, sometimes self-deprecating

Do Say

• ダイエット始めたから甘いもの控えてるの。 (I started a diet so I'm cutting back on sweets.)
• 無理なダイエットは体に悪いよ。 (Extreme diets are bad for your health.)

Don't Say

• 痩せてる人に「ダイエットしなよ」は絶対NG — ボディシェイミングになる (Never tell a thin person 'you should diet' — it's body shaming)

Common Mistakes

• Using ダイエット to mean your regular eating habits (like English 'diet') — in Japanese it specifically implies trying to lose weight

Origin & History

From English 'diet,' but narrowed in Japanese to specifically mean weight loss or calorie restriction. Has been a mainstream Japanese word since the 1960s-70s, when Western health and beauty concepts were widely adopted.

Cultural Context

Era: 1960s-70s adoption, universally used since

Generation: All ages

Social background: Universal

Regional notes: Used across all of Japan. Japan's diet industry is enormous, with new trends appearing seasonally (バナナダイエット, 糖質制限, etc.).