置き換え

• Reading: おきかえ
• Romaji: okikae
• Kanji breakdown: 置 (place, put) + 換 (exchange, replace) → replacement, substitution (of meals)
• Pronunciation: /o.ki.ka.e/

Meaning

Meal replacement diet; substituting one or more meals with shakes, smoothies, or low-calorie alternatives.

置き換えダイエット is one of the most popular diet methods in Japan, where one or two regular meals are replaced with protein shakes, smoothies, or diet foods. Its appeal lies in simplicity — no complex calorie counting, just swap one meal. Products targeting this market flood convenience stores and drugstores. However, nutritionists warn that extreme 置き換え can lead to nutritional deficiencies and リバウンド.

Examples

1. 朝食を置き換えダイエットにしてプロテインだけ飲んでる。 I'm doing a meal replacement diet for breakfast — just drinking a protein shake.
2. 置き換えで1ヶ月3キロ落ちたけど、やめたらすぐ戻った。 I lost 3 kilos in a month with meal replacements, but I gained it all back once I stopped.
3. 置き換えダイエット用のスムージーが最近めっちゃ種類増えたよね。 There are so many more types of meal replacement smoothies out there now, right?

Usage Guide

Context: diet, health, social media

Tone: practical, diet-focused

Do Say

• 置き換えダイエットするなら栄養バランスも考えた方がいいよ。 (If you're doing a meal replacement diet, you should also think about nutritional balance.)
• 昼だけ置き換えにしてる。 (I'm only replacing lunch.)

Don't Say

• 3食全部を置き換えにするのは危険 — 最低でも1食はちゃんと食べるべき (Replacing all three meals is dangerous — you should eat at least one proper meal)

Common Mistakes

• Doing extreme 置き換え (replacing all meals) for quick results — this leads to nutritional deficiency and almost certainly results in リバウンド

Origin & History

From 置き換え (replacement, substitution; 置く = to place + 換え = to exchange). Applied to dieting to describe the method of substituting meals with lower-calorie alternatives.

Cultural Context

Era: 2000s-2010s diet trend

Generation: 20s-40s, dieters

Social background: Universal

Regional notes: Used across all of Japan. Convenience stores and drugstores stock numerous 置き換え products, from protein bars to diet shakes.