Skipping Breakfast Can Be Life-Threatening: Survey on Heatstroke Risks for Outdoor and Industrial Workers
A survey by Taisho Pharmaceutical revealed that nearly half of workers in high-temperature environments skip breakfast occasionally, making them 1.6 times more likely to experience heatstroke compared to those who eat daily. Dr. Hideki Taniguchi emphasizes the vital importance of breakfast and distributed hydration.
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- 📰 Published: May 25, 2026 at 20:00
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In April 2026, Taisho Pharmaceutical Co., Ltd. conducted a heatstroke awareness survey targeting 263 workers aged 20 to 60 in high-temperature environments such as factories and construction sites. The results showed that 133 respondents, roughly half of the group, skip breakfast on some days. Notably, over 30% of this breakfast-skipping group (47 people) reported having experienced heatstroke or similar symptoms—approximately 1.6 times higher than the 29 people who eat breakfast every day.
Dr. Hideki Taniguchi, Director of the Patient Support Center at Saiseikai Yokohama City Eastern Hospital, explained why skipping breakfast is life-threatening. Starting the day without breakfast means beginning in a state of mild dehydration and energy deficit. In hot environments where heavy sweating occurs, this lack of nutrients makes the body's internal balance highly unstable. Insufficient fluid prevents proper temperature regulation, leading to elevated core temperatures. Furthermore, reduced blood circulation limits oxygen and glucose supply to the brain and muscles, causing decreased concentration, slower reflexes, and an increased risk of fatal accidents.
To combat these risks, Dr. Taniguchi recommends the '6 ounce 8 times method,' which involves drinking about 180mL of fluid eight times a day—at wakeup, meals, snacks, and before/after bathing and sleep—to total 1.5 to 2L. Skipping breakfast causes a loss of approximately 400 to 600mL in hydration opportunities. He stresses that a balanced breakfast containing three key components—water for fluid balance, salt (sodium) for electrolytes, and sugar (carbohydrates) for energy—is essential for mitigating heatstroke risks.
Dr. Hideki Taniguchi, Director of the Patient Support Center at Saiseikai Yokohama City Eastern Hospital, explained why skipping breakfast is life-threatening. Starting the day without breakfast means beginning in a state of mild dehydration and energy deficit. In hot environments where heavy sweating occurs, this lack of nutrients makes the body's internal balance highly unstable. Insufficient fluid prevents proper temperature regulation, leading to elevated core temperatures. Furthermore, reduced blood circulation limits oxygen and glucose supply to the brain and muscles, causing decreased concentration, slower reflexes, and an increased risk of fatal accidents.
To combat these risks, Dr. Taniguchi recommends the '6 ounce 8 times method,' which involves drinking about 180mL of fluid eight times a day—at wakeup, meals, snacks, and before/after bathing and sleep—to total 1.5 to 2L. Skipping breakfast causes a loss of approximately 400 to 600mL in hydration opportunities. He stresses that a balanced breakfast containing three key components—water for fluid balance, salt (sodium) for electrolytes, and sugar (carbohydrates) for energy—is essential for mitigating heatstroke risks.
FAQ
暑熱環境で働く人の朝食欠食の実態は？
調査対象となった労働者263名のうち、約半数にあたる133名が「朝食を欠食する日がある」と回答しています。
朝食を抜くことと熱中症発症率の関係は？
朝食を欠食する人の約31%（47名）が熱中症またはその疑いのある症状を経験しており、これは毎日朝食を食べる人の経験率（29名）の約1.6倍に相当します。
朝食を抜くとどの程度の水分が不足しますか？
理想的な水分補給タイミングのうち、朝食時と午前の機会を逃すため、約400〜600mLの水分摂取が不足することになります。
「6オンス8回法」とはどのような方法ですか？
1回あたり約180mLの水分を、起床後、各食事、間食、入浴前後、就寝前など1日8回に分けて合計1.5〜2L摂取する、熱中症対策に効果的な補給法です。
熱中症対策の朝食において特に重要な栄養素は何ですか？
体液バランスを維持する「水分」、失われる電解質を補う「塩分（ナトリウム）」、エネルギー源となる「糖分（炭水化物）」の3つが重要です。