Is a water glass the same for everyone?
The problem with the advice to drink eight glasses of water a day is the glass. The volume of the glasses used in homes varies between 200 mL and 560 mL.
A water glass is not as fixed a measure as it is thought to be. According to the review of kitchen tools in TÜBER, Türkiye's national dietary guideline, in our country the volume of water glasses varies between 200-560 mL, of tea glasses between 85-165 mL, and of the soft drink glasses often used at home in place of water glasses between 160-490 mL. That is why a daily amount of water counted in glasses cannot be read without knowing which glass was counted.
Sources
- TÜBER 2022 — Türkiye Beslenme Rehberi Bölüm 10.2.1, s. 228 Standart ölçü araçlarının tanımlanması — çay bardağı 85-165 mL, su bardağı 200-560 mL, meşrubat bardağı 160-490 mL, kase 130-600 mL; 1 kupa = 240 mL accessed: 2026-08-15
- TÜBER 2022 — Türkiye Beslenme Rehberi Bölüm 10.2.1, s. 229 (Kupa eşdeğerlikleri) 1 yumruk = 1 kupa; küçük kase 12-14 cm / 240 mL = 1 kupa; büyük bardak 360 mL = 1,5 kupa; büyük kase 18-22 cm / 480 mL = 2 kupa accessed: 2026-08-15
- TÜBER 2022 — Türkiye Beslenme Rehberi Ek 1.4.1, s. 253 18-50 yaş için önerilen yeterli su alımı (AI): erkek 2,5 L/gün, kadın 2,0 L/gün accessed: 2026-08-15
- TÜBER 2022 — Türkiye Beslenme Rehberi Bölüm 9, s. 155 Vücut ağırlığı başına 35 mL/kg sıvı alımı accessed: 2026-08-15
General information notice. This content is prepared to support general nutrition literacy; it does not replace medical diagnosis or treatment and is not personal nutrition advice. A plan tailored to you can only be prepared by a licensed dietitian; if you are pregnant, have a chronic condition, take regular medication, are feeding a child, or have a clinical condition, a physician and dietitian check is required before starting a plan.
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