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 why do we need food from different food groups

why do we need food from different food groups

The key to eating well is to enjoy a variety of nutritious foods from each of the Five Food Groups. These Five Food Groups make up the Australian Guide to Healthy Eating (see right). Foods are grouped together because they provide similar amounts of the key nutrients of that food group. For example, the key nutrients of the milk, yogurt, cheese and alternatives food group include calcium and protein, while the fruit group is a good source of vitamins, especially vitamin C. To meet the nutrient requirements essential for good health, you need to eat a variety from each of the five food groups daily, in the recommended amounts. It is not necessary to eat from each food group at every meal. In fact, in some instances, you only need to eat some of the foods in each food group a couple of

 why do you have diarrhea when your sick

why do you have diarrhea when your sick

Nobody likes diarrhea. But is the icky and uncomfortable experience actually the body s way of flushing bad stuff out of your system? In a new study in mice, researchers set out to answer the question of whether diarrhea is simply a symptom of an illness or, instead, a way for the body to quickly get rid of germs. In fact, diarrhea s purpose or lack thereof has been the subject of much scientific debate. The hypothesis that clears intestinal pathogens has been debated for centuries, senior study author Dr. Jerrold Turner, a professor of pathology at Brigham and Women s Hospital in Boston, said in a statement. But the role that diarrhea plays in the progression of intestinal infections remains poorly understood. [ It s not uncommon for the symptoms that accompany an illness to have a

 why do water birds have webbed feet

why do water birds have webbed feet

Ducks, geese, and swans all have webbed feet. The primary use for webbed feet is paddling through water. Here's how it works: as the bird pulls its foot backwards through the water, the toes spread apart, causing the webs to spread out. The webs push more water than just a bird foot with spread-out toes would push. (It would be like trying to swim with your fingers spread apart. ) The webbed feet propel the bird through the water. When the bird pulls its foot forward for the next push, the toes come together, folding up the webs. The foot is instantly less resistant, moving through the water easily to get into place for the next stroke without pushing the bird backwards. Webbed feet are useful on land as well as on water because they allow birds to walk more easily on mud. ...

 why do we have to drink so much water

why do we have to drink so much water

"What works with weight loss is if you choose water or a non-caloric beverage over a caloric beverage and/or eat a diet higher in water-rich foods that are healthier, more filling, and help you trim calorie intake," says Penn State researcher Barbara Rolls, PhD, author of The Plan. Food with high water content tends to look larger, its higher volume requires more chewing, and it is absorbed more slowly by the body, which helps you feel full. Water-rich foods include fruits, vegetables, broth-based soups, oatmeal, and beans. 3. Water Helps Energize Muscles. Cells that don't maintain their balance of fluids and shrivel, which can result in muscle. "When muscle cells don't have adequate fluids, they don't work as well and performance can suffer," says Guest. ...

 why do you draw blood cultures from 2 different sites

why do you draw blood cultures from 2 different sites

At my hospital, we get lots of elderly pts from LTC or SNF's. If these pts have existing PICC lines, Central Lines, or Udall's we always draw one of the cultures from the line in case the infection has originated there. If the draw from the line comes back positive, the line is removed, and the tip is cultured to confirm the bacteremia. In a pt where they do not have an existing line, the cultures are drawn from 2 sites because like checking stool for C-Diff, you can get false readings. ...

 why does maximal voluntary ventilation decrease with age

why does maximal voluntary ventilation decrease with age

In manual ventilation you can increase the PaO 2 by hyperventilating the patient, by increasing the respiratory rate and/or by increasing the volume of air that you deliver to the patient. If using a BVM for example, compressing the bag faster and/or harder will increase the arterial oxygen pressure, but there is a limit to what you can do with manual ventilation. Perfusion in the lungs has a major impact on PaO 2. Also, the blood chenistry (anemia or CO 2 poisoning) for example will dramatically decrease the PaO 2. Sometimes no matter how much you hyperventilate the person, low PaO 2 can't be corrected. Because loss of alveoli is a natural occurrence of aging. ...

 why do we have hair on our fingers

why do we have hair on our fingers

Hair isn't just for looks. The hair on our heads keeps us warm and protects against the sun's harmful ultraviolet rays, while that growing in our noses keeps out dust and other unwanted intruders. But what about the hair on some people's knuckles? "Generally speaking, we don't know," said John Hawks, a biological anthropologist at the University of Wisconsin-Madison. One explanation, Hawks said, is that it's hair leftover from evolution: Our were covered with hair, and we are left with the small patches that seem to have persisted through the weeding out of natural selection. ...

 why do we give gifts to each other at christmas

why do we give gifts to each other at christmas

Exchanging stuff Б as gifts or economic transactions Б and reciprocating those exchanges in a socially acceptable way - is a practice found in all human cultures. The rules and scope of the exchanges may be very different, but the fact of them is universal. French anthropologist Marcel Mauss doesnБt attempt to explain the politics and practice of the office Secret Santa (alas) Б instead, he describes Бarchaic societiesБ in Melanesia, Polynesia and the north-west coast Native American peoples who practiced БpotlatchБ, a ceremonial gift-giving and feasting ritual characterised by competitive shows of conspicuous giving and consumption. These, Mauss says, are systems of gift-giving that arenБt just about gifts, but carry legal, economic, spiritual and moral significance that saturates the

 why does guinness draught have a ball in it

why does guinness draught have a ball in it

In 1969 two Guinness brewers at Guinness's brewery in Dublin, Tony Carey and Sammy Hildebrand, developed a system for producing draught type Guinness from cans or bottles through the discharge of gas from an internal compartment. It was patented in British Patent No 1266351, filed 27 January 1969, with a complete specification published 8 March 1972. Development work on a can system under Project ACORN ( A dvanced C ans O f R ich N ectar) focused on an arrangement whereby a false lid underneath the main lid formed the gas chamber (see diagram below right). Technical difficulties led to this approach being put on hold, and Guinness instead concentrated on bottles using external initiators. Subsequently, Guinness allowed this patent to lapse and it was not until centralised the company's

 why do you think macroeconomists focus on just

why do you think macroeconomists focus on just

Maps can change the cognitive structure used to interpret information and achieve communication a little differently. The use of a map to accomplish communication may not be restricted by the barriers of language. Our attention span is quite limited when delivered an interrelated set of objectives. For example, if one is delivered a list of directions that are interdependent, turn left on Woodward, turn right on Main Street, drive 1/2 mile down, turn right on Blair. It is difficult to remember an interdependent set of directions from the start to finish just because our brain is limited by the cognitive barriers of short term memory and language. Even if the directions are relatively simple, we might have to write them down, follow a list while travelling and we still don't quite know