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Thyroid conditions may make getting pregnant impossible.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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People about to have surgery must tell their health care providers about all supplements they take.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.