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Are
protein shakes a good idea?
Can you get
buff without adding extra protein to your diet? What are the
pros and cons of protein shakes?
By
Martica Heaner
Although
many women avoid lifting heavy weights because they are afraid
they'll get bigger, many men who want to build bulk know that
it's not easy to build muscle. The secret to getting buff
boils down a simple recipe: Lift heavy weights two to three
times a week, and eat more
calories than normal. (Having shorter arms and legs and a
genetic tendency to build muscle also helps.)
The
exercise stimulus creates a sort of muscle breakdown so that
when you sleep, your muscles go into an anabolic state to get
bigger and stronger than before. Consuming extra calories
provides the energy needed for this rebuilding process.
Many
people believe that you need to eat more protein than normal
to fuel muscle growth, but this is not really true for most
weight lifters, according to research by Peter Lemon, a
renowned protein researcher and professor at the University of
Western Ontario in Canada.
More
protein can lead to more body fat
The
recommended daily allowance (RDA) for protein that the average
person should get in their daily diet is 0.8 grams for every
kilogram of body weight. Lemon's research shows that
exercisers need
between 0.8 grams and 1.7 grams per kilogram of body weight.
Some bodybuilders take in four or five times as much as the
RDA-and, according to this research, totally unnecessarily.
Extra
protein does not automatically make extra muscle. In fact, if
you eat more protein than your body uses, it will be stored as
fat. So, bodybuilders who down six chicken breasts at time in
between high-protein shakes and bars may be adding more to
their waistline than their biceps.
Protein
shakes can add as much as 200 grams or 300 grams of protein
(800 to 1,200 calories) a day. If you don't need it, the body
stores all those extra calories as fat. Also, if these shakes
are taking you to the high end of the protein spectrum, you
may be increasing health risks-high-protein diets may cause
bone loss and kidney damage.
There
is some debate about the types of protein in different shakes
or supplements. But the bottom line is, you probably don't
need added protein. And even if you do, it's probably
healthier
to get it from real foods, not processed supplements.
Deducing
your protein quota
An
easy way to calculate your needs is to multiply 0.36 by your
body weight in pounds. So if you weigh 180 pounds, you need
about 65 grams of protein per day, or about 47 grams per day
if you weigh 130 pounds.
If
you consider that the average chicken breast may contain 30
grams to 60 grams of protein, one slice of cheddar cheese has
seven grams, and even one cup of chopped broccoli has about
five grams of protein-it's very easy to get what you need from
the meals and snacks in your day without making an extra
effort. Beginning weight-lifters trying to build muscle need a
little more protein than the RDA. If you are extremely
active-such as an endurance exerciser going on long runs, for
example-you may need about 50 percent more than the RDA, or
1.2 grams of protein per kilogram of body weight, but for a
135-pound woman that's still only about 70 grams per day.
So
while certain exercisers may need more protein, chances are,
you are getting more than enough already. It's unlikely that
even a novice weightlifter will need to supplement over what
they are already eating.
Timing
your muscle fueling efforts
When
you eat protein-and when you eat more carbohydrates-may be
more important than how much and what type of protein you eat.
After
a hard workout, even though you feel ready to quit, your body
isn't: The muscle-building process is about to begin. Your
body is most primed to refuel starting about 45 minutes after
you work out, up to about two hours. So it's time to
eat-ideally, carbs with a touch of protein.
In
this post-workout period, muscles are most highly sensitive to
insulin-and eating triggers the release of insulin. And since
insulin helps shuttle the carbs-or glucose-that you eat into
cells, higher levels mean that more glucose gets in. Plus
insulin activates an enzyme that specifically helps store
extra glucose in your muscles.
That
means your muscles are better fueled for tomorrow's workout.
More insulin also helps trigger protein synthesis. So if you
fuel up post-workout, muscles will pack more protein into your
muscle's fibers.
Research
shows that your post-workout snack should consist of as much
as four times as much carbs to protein, or a 2-to-1 to 4-to-1
ratio, according to John Ivy, a professor of kinesiology at
the University of Texas at Austin. So after a hard workout,
eat a carb- and protein-containing snack or drink.
(Some
people don't feel like eating right after a hard session, so
here's where having a shake or a protein-supplemented energy
drink may be useful.) Foods to nibble on include a handful of
almonds, walnuts, peanuts, pecans, sunflower seeds, peanut
butter on bread, vegetables and fruit with yogurt.
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