题目内容：
Eating potatoes gives your immune system a boost Eating potatoes is not only good for bowel health，but also for the whole immune system，especially when they come in the form of a potato salad or eaten cold． In a study on an animal model，researchers in Spain found that pigs fed large quantities of raw potato starch（RPS）1 not only had a healthier bowel．but also decreased levels of white b1ood cells，such as leucocytes and 1ymphocytes in their blood． White blood cells are produced as a result of inflammation or disease，generally when the body is challenged．The general down—regulatjon of leucocytes observed by the Spanish researchers suggests an o-verall beneficial effect，a generally more healthy body2． The reduction in leucocyte levels was about 15 percent．Lower lymphocyte 1evels are also indicative of reduced levels of inflammation，but the observed reduction in both lymphocyte density and lymphocyte apoptosis is surprising.
In what was the 1ongest study of its kind，pigs were fed RPS over 14 weeks to find out the effect of starch on bowel health． “The use of raw potato starch in this experiment is designed to simulate the effects of a diet high in resistant starch”，said study leader Jose Francisco Perez at the Universitat Au-tonoma de Barcelona3，Spain．
Humans do not eat raw potatoes，but they do eat a 1ot of foods that contain resistant starch，Such as cold boiled potatoes，legumes，grains，green bananas，pasta and cereals．About 10 percent of the starch eaten by human is resistant starch-starch that is not digested in the small intestine and so is shunted into the large intestine where it ferments．Starch consumption is thought to reduce the risk of large bowel cancer and may also have an effect on irritable bowel syndrome（IBS）4．
Immunology expert Lena Ohman’s team previously found that the overall lymphocyte levels do not vary for IBS patients，but that lymphocytes are transferred from the peripheral blood to the gut，which support the hypothesis of IBS being at least partially an inflammatory disorder．She says the de-crease in lymphocytes observed by the Spanish is therefore interesting，and a diet of resistant starch
may be worth trying in IBS patients．Ohman is currently at the Department of Internal Medicine，Goteborg University，Sweden5．The study is published in the journal Chemistry and Industry，the magazine of the SCl6．What a form of potato is the most nutrient to the human body? A．Potato sou
B．Potato cak
C．Potato sala
D．Hot boiled potat
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