Effects of cooking using multi-ply cookware on absorption of potassium and vitamins: a randomized double-blind placebo control study.
This 2-week interventional study involved a randomized allocation of subjects into three groups: Group A (daily ingestion of 350 g vegetables cooked without water using multi-ply [multilayer-structured] cookware), Group B (daily ingestion of 350 g vegetables; ordinary cookware) and Group C (routine living). Before and after intervention, each subject underwent health examination with 24-h urine sampling. Blood vitamin C significantly increased after intervention from the baseline in Group A (P < 0.01) and Group B (P < 0.05). β-Carotene levels also increased significantly after intervention in Group A (P < 0.01) and Group B (P < 0.01). Oxidized low-density lipoprotein decreased significantly after intervention in Group A (P < 0.01). In Group A, 24-h urinary potassium excretion increased significantly (P < 0.01) and 24-h urinary sodium (Na)/K ratio improved significantly (P < 0.05) after intervention. In conclusion, a cooking method modification with multi-ply cookware improved absorption of nutrients from vegetables and enhanced effective utilization of the antioxidant potentials of vegetable nutrients.
Mukogawa Women's University Institute for World Health Development, Edagawa-cho, Nishinomiya-shi, Hyogo, Japan. m_mori@viola.ocn.ne.jp
Mari
M
Mori
Atsumi
A
Hamada
Hideki
H
Mori
Yukio
Y
Yamori
Kinsuke
K
Tsuda
D000293:Adolescent; D000328:Adult; D000975:Antioxidants / Q000378:metabolism*; D001205:Ascorbic Acid / Q000097:blood*; D003296:Cooking / Q000379:methods*; D004032:Diet; D004311:Double-Blind Method; D002149:Energy Intake; D005260:Female; D006801:Humans; D007408:Intestinal Absorption; D008077:Lipoproteins, LDL / Q000097:blood; D008297:Male; D018977:Micronutrients / Q000378:metabolism; D011188:Potassium / Q000652:urine*; D012964:Sodium / Q000652:urine*; D014675:Vegetables / Q000737:chemistry*; D055815:Young Adult; D019207:beta Carotene / Q000097:blood*
D000975:Antioxidants; D008077:Lipoproteins, LDL; D018977:Micronutrients; C099252:oxidized low density lipoprotein; D019207:beta Carotene; D012964:Sodium; D001205:Ascorbic Acid; D011188:Potassium