ABOUT
MILK,
CALCIUM & BONE HEALTH.
Energy:
129 calories (540 kJ) for 2% white milk
| |
Nutrient |
Nutritional
Benefit |
| |
Protein |
Builds
and repairs body tissues, including bones; builds antibodies,
the part of blood that fights infection. |
| |
Carbohydrates |
Supply
energy and assist in the utilization of fats |
| |
Fat |
Assists in the absorption of fat-soluble vitamins |
| |
Vitamin
A |
Helps
normal bone and tooth development; maintains the health
of skin and membranes |
| |
Thiamin |
Releases
energy from carbohydrates |
| |
Niacin |
Assists
normal growth and development; maintains a normal nervous
system and gastrointestinal tract |
| |
Folacin |
Contributes
to red blood cell formation |
| |
Pantothenate |
Aids
in release of energy from carbohydrates and in breakdown
and metabolism of fat
|
| |
Phosphorus |
Helps
in the formation and maintenance of strong bones and
teeth |
| |
Vitamin
D |
Enhances
calcium and phosphorus utilization in the formation and
maintenance of healthy bones and teeth |
| |
Riboflavin |
Maintains
healthy skin and eyes maintains a normal nervous system;
releases energy to body cells during metabolism |
| |
Vitamin
B6 |
Helps
in many aspects of protein metabolism; and assists in
the formation of red blood cells |
| |
Vitamin
B12 |
Contributes
to red blood cell formation; helps maintain healthy nerve
and gastrointestinal tissues |
| |
Calcium |
Helps
in the formation and maintenance of strong bones and
teeth, promotes healthy nerve function and normal blood
clotting |
| |
Magnesium |
Maintains
strong bones and teeth; helps in energy metabolism and
tissue formation |
| |
Zinc |
Contributes
to energy metabolism and tissue formation |
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P4B nutrition
recommendations are based on 2 documents: Eating Well with
Canada’s
Food Guide (published in 2007), and the
Dietary Reference Intake (DRI) for calcium (published
in 1997). Canada’s Food Guide recommends
children age 9 to 18 consume 3 to 4 servings of milk and
alternatives every day. The DRI recommendation for children
age 9 to 18 is 1300 mg of calcium per day (DRI). The upper
range, i.e. 4 servings of milk and alternatives per day,
provides about 1200 mg of calcium – which is closer
to the DRI calcium recommendations for this age group.
This
is why we will always refer to the upper range of milk
and alternative servings recommended in Canada’s
Food Guide in the Power4Bones program.
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Health
Canada recommends children age 9 to 18 consume 3 to 4
servings of milk and alternatives daily as recommended
in Canada’s
Food Guide. In 1997 requirements for nutrients were
published stating that for children age 9 to 18, the calcium
recommendation is 1300 mg per day. In the
Canadian diet, milk and alternatives offer a rich source
of calcium and other bone-building nutrients. One serving
of milk or alternatives (e.g.,1 cup of milk, 3/4 cup of
yogurt, 50 g cheese) provides about 300 mg of calcium,
so 4 servings would be needed to almost reach the requirement.
The extra
100 mg of calcium needed per day can easily be met when
the child eats other foods containing small amounts of
calcium (e.g., fish with bones, some vegetables, some legumes).
For adequate Vitamin D, Health Canada recommends all Canadians
drink 2 cups of milk per day.
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A brand
new Canada’s Food Guide was launched
in February 2007. The Food Guide is revised regularly and
it is based on scientific research.
Food guides recommend what we should eat and in what amounts
to get all the nutrients we need. They also reflect the
foods that are most available in our country.
One cup
of milk, 3/4 cup of yogurt or a 50 g portion of cheese
are examples of a serving of a milk and alternatives. Canada's
Food Guide currently recommends 3 to 4 servings per day
for children age 9 to 18. The upper recommendation of
4 servings per day is appropriate to cover the current
calcium recommendations (1300 mg of calcium per day) for
this age group.
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Why
is calcium so important?
Calcium
is an essential nutrient. This means it is a nutrient our
bodies can't make and we need to get enough of it from the
food we eat. Calcium helps to build strong bones and teeth.
Calcium is also needed for muscles like the heart to contract,
blood to clot, and nerve impulses to transmit in the body.
If your calcium needs are not met through the foods you eat,
it will be withdrawn from your bones which can cause bone
weakness. Therefore, we need to stock our bones well as a
child and maintain them as we get older. Your bones act as
a storehouse for calcium. Milk and alternatives are all sources
of calcium. However, only fluid milk also contains vitamin
D. Vitamin D helps our body absorb calcium and is equally
important for bone health.
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In
1997, Canada and the US came out with Dietary Reference Intakes
(DRI) for calcium, phosphorus, magnesium, vitamin D and fluoride.
All of these nutrients are involved in maintaining bone health.
The main difference between the old Canadian recommendations
and the new DRIs is that the recommendations for calcium,
vitamin D and magnesium have increased for most of us. The
recommendation for phosphorus decreased slightly for adults
and recommendations were newly developed for fluoride. By
choosing a variety of foods from the 4 food groups and
the maximum number of servings of milk and alternatives every
day, you can make sure you get enough of these 5 bone-building
nutrients.
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Bones
need more than just calcium to be strong. They need vitamin
D to use calcium and optimize bone mineralization. Without
vitamin D, your body absorbs only about 10 to 15% of the
calcium you eat.
Other
than fluid milk, food sources that contain vitamin D are
liver, fish oils, eggs and fortified margarine. Milk and
alternatives such as cheese and yogurt are nutritious choices;
however, only fluid milk is fortified with vitamin D.
While
we do make vitamin D naturally when our skin is exposed
to sunlight, certain factors that block this process include
age, season, use of sunscreen, clothing, latitude, and
glass windows. Without fluid milk, it may be very difficult
for older adults and young children to meet their vitamin
D requirements.
In the
new food guide Health Canada recommends that all Canadians
should drink 500 mL (2 cups) of milk each day to make sure
that their vitamin D requirements are met. In addition,
Canadians over 50 years of age are recommended to take
a 400 IU supplement of Vitamin D.
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Yes. Like white milk, chocolate milk and other flavoured
milks are healthy bone building choices. Chocolate milk
is made from fresh white milk and it has all the nutrients
you find in white milk, including calcium and vitamin
D. Both white milk and chocolate milk are considered
excellent sources of calcium. There's very little caffeine
in chocolate milk, and it contains about the same amount
of sugar as you would find in an equal amount of most
unsweetened fruit juices.
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Unfortified
soy beverages contain, on average, 28 mg of calcium per 250
mL (1 cup) serving and no Vitamin D, compared to 315 mg of
calcium and 100 IU of Vitamin D for cows' milk. Milk also
has considerably more riboflavin, vitamins B5, B12, A and
D than soy beverages. Health Canada has now allowed manufacturers
to fortify soy beverage with nutrients (including calcium
and vitamin D) to mimic cows' milk. However, not all soy
beverages are fortified with the same amount of calcium and
Vitamin D. Check the product label to see how much calcium
is provided on a per serving basis.
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There
are more nutritional similarities than differences between
goats' and cows' milk. They have a similar fat, protein,
and carbohydrate content, and both are excellent sources
of calcium and riboflavin. Because the lactose content is
the same, goats' milk is not any better tolerated by lactose
maldigesters. Unlike cows' milk, goats' milk contains very
little folic acid, is low in vitamin B12, and is not fortified
with vitamin D. Some processors may voluntarily add vitamin
A and vitamin D to their product, but this is not required
by law.
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Whole
or 2% milk is a good choice for most young children and
whole milk is actually recommended by the Canadian Pediatric
Association for infants up to 2 years of age. After 2 years
of age, the family's preferred type of milk is fine. The
only difference between the different types of milk is
the fat content; the nutrient composition is the same.
However,
it is important to remember that children need plenty of
nutritious, energy-dense foods to grow and develop to their
full height and size. Because fat is the highest source
of energy in the diet, it gives children more energy in
a smaller amount of food. Canada's Food guide reminds parents
and caregivers that children should not restrict nutritious
foods because of their fat content.
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If your
kids don't drink enough milk, you can help them get the
nutrients and the energy they need by serving them a combination
of foods made with milk or milk alternatives. Plus, you
can always offer them yogurt or cheese.
The calcium
requirements for children are:
| Age |
Adequate
Daily Requirement |
| 1-3 |
500
mg |
| 4-9 |
800
mg |
| 10-18 |
1300
mg |
| (source:
1997 Dietary Reference Intakes, National Academy of
Medicine) |
Estimated
Calcium Content of Selected Food Sources
| Milk
& Milk Products |
Serving
Size |
Calcium |
| *Milk
(1%, 2%, skim, whole, lactose-free) |
1
cup |
315
mg |
| *Chocolate
milk |
1
cup |
300
mg |
| Plain
yogurt |
3/4
cup |
320
mg |
| Fruit-bottom
yogurt |
3/4
cup |
281
mg |
| Cheddar
cheese |
50
g |
363
mg |
| Mozzarella
cheese |
50
g |
268
mg |
| Swiss
cheese |
50
g |
476
mg |
| Feta
cheese |
50
g |
255
mg |
| Cottage
cheese |
1
cup |
164
mg |
| Yogurt
beverage |
200
mL |
220
mg |
|
Soups
made with milk
(such as cream of chicken or mushroom) |
1
cup |
192
mg |
If a child doesn't consume milk and alternatives, meeting
calcium requirements may be achieved with careful planning
through other food sources. Some other food sources that
contain calcium are:
| Beans
& Bean Products |
|
|
| Tofu
(with calcium sulphate) |
150
g |
157
mg |
| White
beans |
3/4 cup |
151
mg |
| Chickpeas |
3/4 cup |
57
mg |
| Baked
beans |
3/4 cup |
100
mg |
| *Fortified soy
beverage |
1
cup |
310
mg |
| Nuts
& Seeds |
|
|
| Almonds |
1/4 cup |
103
mg |
| Sesame
seeds |
1/4
cup |
46
mg |
| Fish |
|
|
| *Salmon,
canned, with the bones |
1/2
cup |
181
mg |
| *Sardines,
canned, with bones |
4 |
183
mg |
| Fruits
& Vegetables |
|
|
| Turnip
greens |
1/2 cup |
104
mg |
| Bok
choy, okra |
1/2 cup |
84
mg |
| Dried
figs |
3
medium |
81
mg |
| Orange |
1
medium |
52
mg |
| Kale |
1/2 cup |
49
mg |
| Broccoli |
1/2 cup |
50
mg |
*Indicates
source also contains vitamin D.
From
9 up to age 18, requirements for calcium are 1300 mg each
day. From age 19 to 49, a person requires 1000 mg of calcium
per day. By consuming the maximum number of servings from
the milk and alternatives food group on Canada’s Food
Guide, i.e., 4 servings each day for 9 to 18-year-olds, a
youngster can adequately meet his/her calcium needs.
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It is
never too early to think about calcium needs, and getting
enough calcium as a teenager can help prevent osteoporosis
in later years. Children age 9 to 18 require 1300 mg of
calcium per day. Experts agree that the main source should
be food — especially milk and milk alternatives.
An important
point is that all milk has the same amount of calcium and
vitamin D regardless of its fat content. For example, 1
cup of skim milk has 91 calories, virtually no fat (0.5
grams) and 315 mg of calcium, plus vitamin D. It is
important for weight conscious teens and adults to recognize
that milk is not fattening. Canada's Food Guide recommends
that youngsters between 9 and 18 years of age consume
3 to 4 servings from the milk and alternatives food group
each day. And the upper range of 4 servings provides 1200
mg of calcium per day – close
to the current recommendations.
If a
person doesn't consume milk and alternatives, meeting calcium
requirements may be achieved with careful planning through
other food sources. Other food sources that contain calcium
that the body can absorb are:
| Kale
(cooked 1/2 cup) |
49
mg calcium |
| Broccoli
(cooked 1/2 cup) |
50
mg calcium |
| Bok
choy (cooked 1/2 cup) |
84
mg calcium |
| Almonds
(1/4 cup) |
103
mg calcium |
| Salmon,
pink, canned with bones (1/2 cup) |
181
mg calcium |
| Sesame
seeds (1/4 cup) |
46
mg calcium |
For people who can't get enough calcium through food, a calcium
supplement is worth considering. Your physician and registered
dietitian can help advise you on an eating plan that is personalized
to meet specific needs and can provide information on specific
vitamin and mineral supplements.
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While
some vegetables do contain calcium, you need to consider
-
the
quantity of calcium present,
-
the
amount of calcium the body can absorb from the vegetable,
and
-
the
amount of the vegetable that a person would have to consume
to meet their calcium requirements.
Vegetables
that offer highly absorbable calcium include broccoli, kale
and bok choi. However, you would have to consume at least
3 cups of broccoli to get the same amount of calcium
as you would get from 1 cup of milk!
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If
you are concerned about eating too much fat and calories
in your diet, simply choose lower-fat milk and alternatives
when trying to meet your calcium requirements. Canada's Food
Guide recommends that children not restrict
nutritious foods because of their fat content.
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Very
few foods other than milk, cheese and yogurt contain substantial
amounts of calcium. Milk also contains vitamin D, which helps
the body absorb the calcium better. In general, diets low
in calcium tend to be low in other essential nutrients. Supplements
cannot replace a healthy diet because their nutritional value
is not equivalent to the nutritional value of foods such
as milk.
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Yes;
however, it is important to remember that even with a relatively
high salt intake, your bones will remain healthy as long
as your calcium intake is adequate. Limit your salt intake
and at the same time include several servings of calcium-rich
foods. Avoid regularly adding salt to your food, check labels
for salt or sodium content, and only eat salty foods in moderation.
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For most
people, eating a variety of foods suggested by Canada's
Food Guide will provide all the necessary
nutrients you need each day. The average healthy person
does not require vitamin pills, even on a stressful day.
Daily
calcium requirements vary depending on age and sex. If
you are eating the recommended number of servings from
the milk and alternatives food group, then you can probably
be assured that your calcium requirements are being met.
If a person doesn't consume milk and milk alternatives,
meeting one's calcium requirements may be achieved with
careful planning through other food sources.
For people
who can't get enough calcium through food, a calcium supplement
is worth considering. Your physician and registered dietitian
can help advise you on an eating plan that is personalized
to meet your specific needs and can provide information
on specific vitamin and mineral supplements.
Health
Canada does recommend that in addition to following Canada's
Food Guide, adults over the age of 50 should take a Vitamin
D supplement of 400 IU daily.
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Health
Canada recommends that we not exceed 400 mg of caffeine per
day, which is equal to 3 to 4 cups of coffee a day. Too much
caffeine can force calcium out of your body, so try to stick
to the 3 to 4 limit and remember to choose at least 2 servings
of milk and alternatives every day.
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For every
1 gram of protein we eat, we lose only 1 mg of calcium.
Milk and alternatives have substantially more calcium
than protein. For example, one cup of milk contains
315 mg of calcium but only about 9 grams of protein. Any
small losses of calcium that might occur are more than
compensated for.
Canadians
should be reminded to follow Canada's Food Guide to Healthy
Eating and meet their minimum number of servings from each
food group in the recommended serving size. Generally speaking,
eating foods rich in calcium throughout life, combined
with regular weight-bearing exercise, has proven to be
the best prescription for maintaining the health of our
bones.
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Magnesium,
phosphorus and fluoride act like cement to help maintain
bone strength. These minerals are widespread in many different
foods. Magnesium is especially found in green, leafy vegetables,
whole grain products, milk, nuts, beans, bananas and apricots.
Phosphorus is especially plentiful in meats, milk products,
nuts, peas and beans. Most people get adequate fluoride from
their local water supply if it has been fluoridated and from
fluoridated toothpaste.
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The
number of proven cows' milk allergies is rare: less than
1% in adults and less than 3% in children. Before making
any changes to your diet, you should first be seen by your
doctor. Once a cows' milk allergy has been confirmed, you
should see a registered dietitian specializing in food allergies.
The dietitian will advise you on a diet that does not contain
milk products but is nutritionally adequate. Typically, a
milk allergy isn't necessarily life long and is outgrown
by most children by the age of 3.
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Milk
contains a natural sugar called lactose. People who are
lactose intolerant or, more precisely, who are lactose
maldigesters, lack enough of the enzyme (lactase) needed
to completely digest the lactose. Lactose intolerance refers
to the symptoms of gastrointestinal discomfort that some
people feel after drinking milk or eating lactose-containing
foods. With a little experimentation, some people find
they can tolerate small servings of milk spread throughout
the day. Certain cheeses and yogurts are lower in lactose.
Other people use special lactose-free milk such as Lactaid
or Lacteeze.
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This
is milk in which the naturally occurring sugar called lactose
is broken down. The lactose is broken down by adding the
enzyme lactase during processing. About 99% of the lactose
is broken down. Although these products can be beneficial
for lactose maldigesters, they are generally unnecessary
if milk is consumed in moderate amounts, and combined with
other foods.
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