How to say "low-fat" in Japanese

• ローファット
  nounA direct borrowing of the English word, used for foods and diets with reduced fat, especially in product names, menus and advertising; it means exactly what 'low-fat' means in English, with a loanword flavor.
• 低脂肪ていしぼう
  no-adjectiveThe Sino-Japanese term for reduced fat content in food and drink; this is what you see on packaging and in dietary advice, and the natural choice for low-fat foods or a low-fat diet.
• 低脂質ていししつ
  na-adjectiveThe technical choice: 脂質 means 'lipid', the nutrient listed on nutrition labels, so this belongs to nutritional and clinical discussion of diet composition; for describing low-fat foods, 低脂肪 is the word you want.

All three mean reduced fat: 「ローファット」 is the English loanword seen in food marketing, 低脂肪 the general term for low-fat foods and diets, and 低脂質 the nutrition-science term that treats fat as the nutrient lipid.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ローファットlow-fat
• 低脂肪ていしぼうlow-fat
• 低脂質ていししつlow-fat