Your metabolism is the rate at which you burn off energy from the food you eat. Everybody's metabolism is slightly different, so everybody has slightly different needs when it comes to calories. As a general rule, the smaller and more physically active you are, the faster your metabolism.
Giardiasis is an intestinal infection of man and animals caused by a protozoan parasite Giardia intestinalis (also known as Giardia lamblia). Giardia is a simple one-celled parasitic species; it is not a worm, bacteria or virus. The parasite occurs worldwide and is a common cause of Traveler's Diarrhea in people.
The cause of about half of all pericarditis cases (both acute and chronic) is unknown. Viral infections are likely the most common cause of acute pericarditis, but the virus may never be found. Pericarditis often occurs after a respiratory infection. Bacterial, fungal, and other infections also can cause pericarditis. Less often, pericarditis is caused by: Autoimmune disorders, such as lupus, scleroderma, and rheumatoid arthritis. Heart attack and heart surgery. Kidney failure, HIV/AIDS, cancer, tuberculosis, and other health problems.