Tac hai cua thieu va thua vitamin A D
Hai loai vi chat tren rat can thiet cho co the, song neu bo sung khong thich hop co the gay nguy hiem. Thua vitamin A se sinh dau xuong khop, con thieu vitamin D de dan den gay coi xuong. Vitamin A la thanh phan thiet yeu cua sac to vong mac nen rat quan trong doi voi mat. Ngoai ra, no con giup giu toan ven lop te bao bieu mo bao phu be mat va cac khoang trong co the. Thieu vitamin A se gay kho da o mang tiep hop, giac mac, nang hon se lam thung giac mac va dan den mu loa. No con gay sung hoa nang long, be mat da thuong noi gai, lam giam toc do tang truong va suc de khang cua co the voi benh tat.
Thua vitamin A se gay dau bung, buon non, bo pho, cham chap, phu gai thi, bong da toan than. Ngo doc co the xay ra khi uong tren 40.000 don vi moi ngay, gay dau xuong khop, rung toc, moi kho nut ne, chan an, gan lach to. Doi voi phu nu mang thai 3 thang dau, neu dung qua 10.000 don vi vitamin A moi ngay co the khien thai nhi di dang. Beta caroten - mot tien to cua vitamin A co hoat tinh cao nhat - co the lam vang da, nhat la o gan ban tay, chan. Nhu cau hang ngay ve vitamin A o tre em la 400mcg va nguoi truong thanh la 600mcg. Vitamin D - Ergocan-xiferol D2, Cholecan-xiferol D3
Thieu vitamin D dan den coi xuong. Doi voi tre duoi 2 tuoi, thieu vitamin D sinh roi loan ban dau khong dien hinh nhu de bi kich thich, ra mo hoi, sau do lam cham moc rang, mem xuong so, de bi co giat. Khi tre biet dung se de cong cot song, chan vong kieng. Thua vitamin D, dac biet D2, D3 co lieu cao gap hang nghin lan lieu chuan co the gay ngo doc. Cac trieu chung hay gap la kem an, buon non, tieu nhieu, ngung lon, xanh xao, doi khi gay co giat, kho tho. Bac si Pham Thi Thuc, Suc Khoe & Doi Song |
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