Protein is a necessary part of
every living cell in your body. Next to
water, protein comprises up the greatest portion of your body weight. Protein substances make up your muscles,
ligaments, tendons, organs, glands, nails, hair, and many vital body
fluids. It is essential for the growth,
repair, and healing of your bones, tissues, and cells. In addition, the enzymes and hormones that catalyze
and regulate your body processes are comprised of protein. So, you see the proper amount of protein in
your diet is vital for your health and wellbeing.
Protein is
composed of building-block chemicals called amino acids.
There are approximately 28 commonly known
amino acids that your body uses to create all the various combinations of
proteins needed for survival. These 28 commonly known amino acids are further
classified as essential and nonessential amino acids.
Nonessential amino acids can be produced in
your body, while essential amino acids cannot be produced in your body and must
be obtained from the foods you eat.
The sources of protein in your diet
are classified as complete or incomplete.
Complete proteins contain all the essential amino acids and are mostly
from animal sources such as meat, fish, poultry, eggs, and dairy products. Incomplete proteins lack one or more
essential amino acids that your body cannot make itself. Incomplete proteins usually come from plant-
based sources such as fruits, vegetables, grains, and nuts. You must eat incomplete sources of protein in
a combination that contains all the essential amino acids in order for your
body to use them.
As mentioned, you must get your
essential amino acids from your diet because your body cannot make them
itself. Some of the best animal sources
of protein are fish, poultry, lean cuts of meat, and low-fat dairy
products. Some of the best vegetable
sources are beans, nuts, and whole grains.
Protein’s Effect on Aging
Getting enough protein in your diet
is crucial for building and maintaining muscle mass especially as you age. As I mentioned earlier, losing muscle mass is
very detrimental to your health. Age
related muscle loss known as sacopenia can begin in your thirties and
accelerates with age if left unabated.
Sacopenia can lead to muscle weakness, fatigue, insulin resistance, body
fat accumulation, injury, and many other problems we associate with aging.
Increased protein consumption, and
strength training are two of the most effective ways to combat muscle
loss. While 0.8 grams of protein per
kilogram of body weight (0.36 grams per pound) has been the normal
recommendation for daily protein intake, new studies show that 1 to 1.5 grams
of protein per kilogram of body weight (0.45 to 0.68 grams per pound) may be
more beneficial in building, maintaining, and reducing muscle loss.
Protein quality, quantity, and
timing of consumption throughout the day, in conjunction with physical activity,
are all important to the building and maintenance of muscle mass. The goal of protein consumption and lean
muscle mass is to optimize muscle protein synthesis (the biological process by
which muscle cells are regenerated).
Studies now show consuming 25 to 30 grams of high quality protein at
each meal (breakfast, lunch, and dinner) is necessary to stimulate maximal
protein synthesis.
Protein’s Effect on Weight Loss
Scientific research is now
revealing that people who consume higher amounts of protein (20 to 30 percent
of their daily caloric intake), while cutting back on their carbohydrate
intake, tend to lose weight faster and stay leaner than those people on low-fat
diets.
The reason higher protein, lower
carbohydrates diets are more conducive to weight loss and maintenance is
interesting. First, high-protein foods
slow the movement of food from the stomach to the intestines, meaning you feel
full longer and don’t get hungry as often.
Second, protein has a leveling effect on your blood sugar which means
you are less likely to get spikes in your blood sugar that lead to cravings for
carbohydrates. Third, your body uses
more energy to digest protein than it does to digest fat or carbohydrates.
Getting the proper amount of
protein at breakfast is especially important if you are trying to lose
weight. Breakfast is the first meal of
the day and what you eat determines whether you start your day in fat burning
or fat storage mode.
Eating a breakfast rich in
carbohydrates and low in protein (the typical American breakfast) starts your
day in fat storage mode. The cereal,
bread, fruit, and juice you have for breakfast are all carbohydrate based and are
converted into sugar by your body, thus causing a spike in your blood sugar. Then your body produces insulin to take that
blood sugar and store it in your body mostly as body fat. Then soon after your blood sugar drops and
you feel famished, and crave more carbohydrate based foods which starts a cycle
of blood sugar spikes and crashes and its insuring sugar cravings.
On the contrary, having a breakfast
that contains the proper amount of high quality protein such as eggs, lean
meat, and low fat dairy starts your day in a fat burning mode. As mentioned earlier, consuming 25 to 30
grams of protein is necessary for maximal protein synthesis. This building and repair of muscle cells is
very energy intensive and it burns body fat mainly as fuel for this
process. Thus, having 25 to 30 grams of
protein at breakfast activates muscle cell regeneration and also alleviates
blood sugar spikes which lead to cravings.
Now that you know how important
protein is for you, here are some good sources of protein listed by the U.S.
Department of Agriculture to help you get the proper amount in your daily diet.
1 ounce meat, fish, poultry equals
7 grams of protein
1 large egg equals 6 grams of
protein
4 ounces milk equal 4 grams of
protein
4 ounces low-fat yogurt equals 6
grams of protein
4 ounces soy milk equals 5 grams of
protein
3 ounces tofu, firm equals 13 grams
of protein
1 ounce cheese equals 7 grams of
protein
1/2 cup low-fat cottage cheese
equals 14 grams of protein
1/2 cup cooked kidney beans equals
7 grams of protein
1/2 cup lentils equals 9 grams of
protein
1 ounce nuts equals 7 grams of
protein
2 tablespoons peanut butter equals
8 grams of protein
1/2 cup vegetables equals 2 grams
of protein
1 slice bread equals 2 grams of
protein
1/2 cup of most grains/pastas
equals 2 grams of protein
Regular strength training along with proper protein consumption are two of the best ways to build strength, and maintain your muscle mass as you age. You can download my favorite strength training programs by clicking on this link: Forever Fit and Firm.