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.
Certain groups, such as older adults and pregnant women, need larger amounts of some types of vitamin B. Certain conditions, such as Crohnâs disease, Celiac disease, HIV, and misuse of alcohol can result in poor absorption of vitamin B. Symptoms of a deficiency depend on what type of vitamin B you lack. They can range from fatigue and confusion to anemia or a compromised immune system. Skin rashes also can occur.