For females this would usually be finished in about 1 hour 15minutes. For males this would be finished in about 1 hour. Olympic distance triathlon (1500m / 40m bike / 10km run) For females this would take about 2 hours 25mins. For males this would take about 2 hours. Half Ironman (1.9km swim / 90km bike / 21km run) Females usually take about 5 hours 30mins.
Zinc. Night blindness may also be the result of a zinc deficiency which reduces the activity of an enzyme that helps the body produce vitamin A (retinol dehydrogenase). Research has shown that taking a zinc supplement is helpful. Healthcare providers often recommend 15 - 30 mg of zinc daily for vision.
WHY VITAMIN A. Vitamin A deficiency is a public health problem all around the world, affecting more than 100 countries. A lack of vitamin A weakens the immune system, putting a child at greater risk of disease and early death; and it is also the leading cause of preventable child blindness.he solution for correcting vitamin A deficiency lies in improving the childâs diet â through increased consumption of vitamin A-rich foods, naturally rich or commercially fortified foods such as processed oils or sugar.