What are the common misunderstandings about protein intake?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
The market for protein products has grown worldwide, and in Japan too "protein deficiency" is widely talked about. Here we set the national reference values against what people in Japan actually eat, and look at where the real problems lie — above all among older people.
The numbers
| Item | Figure | Source |
|---|---|---|
| Recommended intake (age 18–64) | Men 65 g / women 50 g a day | Dietary Reference Intakes for Japanese (2025 edition) |
| Recommended intake (age 65+) | Men 60 g / women 50 g, but with a target range set higher, at 15–20% of total energy | Same |
| Actual intake (average, age 20+) | About 70 g (men about 78 g, women about 64 g) | National Health and Nutrition Survey (2023) |
| Intake in the 1950s | About 70 g (the amount has not changed; the share from animal sources has grown) | Various studies in nutrition history |
| Food (typical serving) | Protein |
|---|---|
| Chicken breast, 100 g | about 22 g |
| Salmon, 1 fillet (80 g) | about 18 g |
| Egg, 1 (50 g) | about 6 g |
| Nattō (fermented soybeans), 1 pack (45 g) | about 7 g |
| Firm tofu (木綿豆腐, momen-dōfu), 1/3 block (100 g) | about 7 g |
| Milk, 200 mL | about 7 g |
| Cooked rice, 150 g | about 4 g |
[Verify] Check recommended intakes against the *Dietary Reference Intakes for Japanese (2025 edition)*, intake against the latest National Health and Nutrition Survey, and food values against the *Standard Tables of Food Composition in Japan (8th revised edition)*.
Misunderstanding 1｜Japanese people lack protein
The adult average is above the recommended amount. Those most likely to fall short are older people with small appetites, people who skip breakfast, and people on extreme diets.
Misunderstanding 2｜Without protein powder you cannot get enough
One serving of meat, fish, egg, soy or dairy at every meal gets most people to the recommended amount. Powder is a supplement for when food alone is difficult.
Misunderstanding 3｜The more you eat, the more muscle you build
Anything above about 1.2–2.0 g per kg of body weight (depending on how active you are) is generally described as being used for energy rather than built into muscle. People with reduced kidney function may need to limit protein; ask a doctor.
Misunderstanding 4｜Older people should cut down on meat
The opposite. A protein shortfall in later life is generally linked to loss of muscle mass (sarcopenia and frailty), and the reference intakes set a higher target for older people at 15–20% of total energy. Foods that are easy to chew (minced meat, fish, egg, tofu) are the practical route.
Misunderstanding 5｜One big protein meal is enough
Spreading protein across three meals is generally described as more efficient than loading it into one. Breakfast is where protein is most often missed (see our article on breakfast).
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Sources
- Ministry of Health, Labour and Welfare, *Dietary Reference Intakes for Japanese (2025 edition)* [日本人の食事摂取基準（2025年版）]
https://www.mhlw.go.jp/stf/newpage_44138.html
- Ministry of Health, Labour and Welfare, *Summary of the 2023 National Health and Nutrition Survey* [令和5年 国民健康・栄養調査結果の概要]
https://www.mhlw.go.jp/stf/newpage_47433.html
- Ministry of Education, Culture, Sports, Science and Technology, *Standard Tables of Food Composition in Japan, 8th revised edition, 2023 supplement* [日本食品標準成分表（八訂）増補2023年]
https://www.mext.go.jp/a_menu/syokuhinseibun/mext_00001.html
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
This article is not meant to diagnose or manage any specific medical condition. If you are worried about your health, see a doctor rather than relying on your own judgement.
Sources
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