memang benar konsumsi vitamin A dan wortel berlebihan justru tidak berguna.. konsumsi saja secukupnya jika memang membutuhkan asupan Vitamin A. Mitos ini berkembang pas era perang dunia II. Dan ini saya copas yang lebih menarik
Carrots, carotene and seeing in the dark
Wayne Smith FAFPHM,1 Paul Mitchell FRACO2 and Ross Lazarus FAFPHM3
1National Centre for Epidemiology and Population Health, Australian National University, Canberra, ACT, 2Department of Ophthalmology and 3Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia
Abstract nya
Should older people eat more carrots, or at least increase their carotene intake to prevent loss of night vision? Participants in the Blue Mountains Eye Study were asked about their ability to see in the dark. Nutrient and food intake were estimated from a food frequency questionnaire. Associations between self-reported poor night vision and estimated nutrient intake were investigated using logistic regression.
Poor night vision among women was associated with higher beta-carotene (P for trend=0.03) and total vitamin A intake (P for trend = 0.048). Increased consumption of carrots, but no other food high in beta-carotene, was asso- ciated with significant increased reporting of poor night vision among women (P for trend = 0.04). While carrot intake may protect against difficulty in seeing at night, it is probable that people attributing poor driving ability to their vision may be eating more carrots in the hope of reversing this decline.
Result
Table 1 shows that self-reported poor night vision among women was associated with higher intakes of beta-carotene (P for trend = 0.03) and total vitamin A (P for trend = 0.048). However, no associations between night vision and either
beta-carotene or vitamin A intake were apparent for men. Retinol intake was not found to be associated with poor night vision in women, but a borderline significant protec- tive association was apparent for men, with an odds ratio of 0.55 (0.29–1.02) for intakes greater than the lowest quintile for retinol.
Table 2 shows associations between self-reported poor night vision and consumption of a number of foods with high carotene content. No foods apart from carrots were associated with poor night vision among either men or women.
In women, increased intake of carrots was associ- ated with significant increased reporting of poor night vision (P for trend = 0.04).Reports of poor night vision were not associated with intake of dietary supplements containing either carotene or vitamin A: age- and sex-adjusted odds ratios 0.94 (0.61–1.45) and 1.00 (0.56–1.75), respectively. The associa- tions between poor night vision and nutrient intake remain approximately the same after adjusting for supplement use.
None of the associations between reports of poor night vision and nutrient intakes was substantially altered after adjusting for the presence of degenerative eye diseases.
kalau doyan journal bisa lirik ke sini, kebetulan karena udah lama jadi bisa dapat jurnalnya
:
http://onlinelibrary.wiley.com/store/10.1046/j.1440-1606.1999.00187.x/asset/j.1440-1606.1999.00187.x.pdf;jsessionid=E04E61E42F261D900B6C0C4B7A3D1B6A.f01t02?v=1&t=hpul9ymk&s=7520be6a73efa2bd453abe1bcaf2c5460ddc0615