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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.