Watching Your Food Digest
Watching Your Food Digest--In a
Fake Gut |
![Drawing: The human digestive tract -- can you find your food?](digestive.jpg) |
Have you ever wondered what happens to
your food after you swallow? Well, we all know that it goes down to the stomach
and it starts making some really weird noises. That's because it's
digesting. But, do you know what's actually happening? Now, there is a
way to see what's going on down there. |
ARS human physiologist (fizz-ee-ah-lo-jist) Raymond Glahn with the U.S. Plant,
Soil and Nutrition Laboratory in Ithaca, New York, has invented a fake gut. The gut will help him
understand how our bodies use the nutrients in the food we eat. Dr. Glahn's
fake gut uses cells from the human intestine called Caco-2. The gut
is the first to model in the lab what happens in a human intestinal tract. Most
important, it shows the food digestion process and absorbs nutrients just like
the real thing. |
![Photo: Fake gut guy Raymond Glahn at the U.S. Plant, Soil and Nutrition Lab in Ithaca, New York](glahn.jpg) |
Imagine being able to watch your pizza, soda,
ice cream and popcorn all mix together in one big bowl of mush. You'd probably
rather be watching TV, but watching food is Dr. Glahn's job. He puts
foods such as cereals, baby formulas, rice and corn into the fake gut. He chose
these foods because of how much iron they have. |
![Animation: Bite by bite, a hot dog is eaten by an invisible diner -- Whoa, where'd it go?](disappearingdog.gif) |
![Photo: Assorted baby food products and nutrient supplements](products.jpg) |
Iron is an important nutrient for people to
eat, so scientists want to learn more about it. Still, many people,
particularly women and young children, often don't get enough iron in their
diet. Without enough iron, you don't form enough red blood cells and
thus don't get enough oxygen. You could then have a condition called anemia
(ah-nee-mee-ah) that makes you weak, tired, pale
and cranky. It is especially important for mothers to get enough iron
when they are going to have a baby so that the baby is healthy.
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"Yikes, not
another one!" |
Dr. Glahn is trying to measure how much of
the iron in foods our body actually absorbs. He is using the fake gut because
it is too hard and expensive to do this experiment with animals. It costs a lot
of money and the animals get full, unlike the fake gut.
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![Drawing: Hamburger that looks gigantic (if you are a mouse)](bigburger.gif) ![Animation: Cartoon mouse sees a gigantic hamburger, screams, spins around and runs away](scaredmouse.gif) |
It takes the fake gut
three hours to digest all of the food. After it digests, Dr. Glahn measures the
amount of ferritin (fair-ah-tin), an iron storage
protein, to see how much of the iron was absorbed.
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Orange juice is one source of
vitamin C. |
So far, Dr. Glahn and his team have found
that adding vitamin C to rice cereal increases the amount of iron that the body
absorbs. It's not only how much iron a food has that's important, but how your
body uses it.
There are more than 2 billion people in the
world suffering from iron malnutrition. This research can help food companies
improve nutritional content of their products. It will also help scientists to
find out how much iron and zinc are found in important foods like beans, corn,
wheat and cassava. |
![Photo of an orange arrangement: Whole and sectioned fruit and a glass and pitcher of juice](orangejuice.jpg) |
--By Sarah
Tarshis, based on an Agricultural Research magazine article by
Hank
Becker, both formerly with the Information Staff, Agricultural Research Service.
If you really want to get into Dr. Glahn's fake gut work, then click here and read
the magazine's longer version.
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