71.   Like most animals, we produce a lot of melatonin early in life, but our blood levels drop sharply around puberty and decline steadily as we get older.

72.   Ludwig explained that a sharp rise in blood glucose results in a surge of insulin to restore a normal blood glucose level.

73.   Millions of men are tested annually for blood levels of PSA, or prostate-specific antigen, as a way of detecting prostate cancer in early stages.

74.   Medication for lead poisoning, called chelation therapy, would not be offered until blood lead levels were substantially higher, Gemmel said.

75.   Now Costa Ricans have one-tenth the lead in their blood levels they had a decade ago, Figueres said.

76.   Nuts contain several vitamins and minerals that protect against heart disease, high blood pressure and stroke, including folate, which lowers blood levels of homocysteine.

77.   Oats, rye and barley are better sources of soluble fiber, which lowers the blood cholesterol level by binding to the fat and carrying it away.

78.   Ornish said the patients who followed his program ended up with lower blood levels of cholesterol, less chest pain and improved heart function.

79.   Over a three-year period, children in the study lowered their blood cholesterol levels without interfering with their growth, nutritional status or emotional well-being.

80.   Patients who carefully control their blood glucose levels have been shown to have less diabetes complications.