What is your opinion of Soy Protein?
Soy is an excellent
protein source. For vegetarians, its amino acid ratios are
pretty close to the complete proteins obtained through animal
If that's all you wanted, I can leave it at that. If you want
my opinion on soy as it's being marketed today, sit back,
here goes . . . .
I'd caution people against believing that since soy has been
touted as having hormonal and health benefits (based on partial
research information rather than "whole picture"
science), that more is better and better. Excesses in soy
intake have been linked to irregularities in thyroid hormone
production. It's suspected that high amounts of soy affect
iodine levels. If soy based foods and soy protein supplements
amount to less than 1/3 of daily protein intake, I don't see
any reason for concern. Assuming it is consumed with a variety
of carb sources, I wouldn’t worry too much about the thyroid
being affected. I would strongly advise anyone against making
soy their exclusive source of protein or putting soy protein
alone in the digestive tract more than once or twice a day.
Supplement manufacturers have done a wonderful job of confusing
the fitness wanting public. For the last five years the bodybuilding
community has gobbled up whey protein. Recent researched suggested
that due to its quick gastric emptying properties, many of
the amino acids get metabolized by liver enzymes, making it
a less than ideal protein source if consumed alone. The whey
manufacturers first responded by increasing the number of
grams per serving. Why not? More protein would have to be
consumed, thus more protein is sold.
Soy found its popularity primarily among vegetarians. The
Soy industry watched as whey protein sales skyrocketed, thus,
in order to grab their own position, they capitalized within
a "health" marketplace, primarily targeting women.
Many of the referenced studies are valid, but as I mentioned
earlier, are not representative of "the whole picture."
In one particular
study published in France, two groups of apparently healthy
men were fed isocaloric diets with one group using soy protein,
the other using animal products as a protein source. The goal
was to see if there was a reduced propensity for gallstones
if animal proteins are replaced by soy. Since gallstone accumulation
can be linked with crystallization of cholesterol, at its
conclusion the study examined cholesterol levels. The study
showed that cholesterol crystallization was slightly retarded
in the soy group extrapolating that soy can aid in preventing
gallstones. Here’s what the study neglected to address. There
wasn’t any control over fruit and vegetable intake. Soy is
a vegetable, and it does happen to fall into the group of
veggies that are high in isoflavones. Isoflavones have been
closely linked to health benefits including a lowering of
cholesterol. We’ve known for years that a predominance of
animal meats can have adverse affects on cholesterol, but
that doesn’t mean that someone consuming soy would have better
cholesterol levels than someone eating combinations of chicken
breast, turkey breast, fish, and egg whites and a variety
of natural vegetables.
You can see how
the conclusions drawn from studies can be misconstrued and
over-emphasized in significance. While a great number of scientific
studies can be held up to show the cancer resistive benefits
of a diet rich in vegetable foods (soy included), we can not
extrapolate from those studies that someone consuming soy
instead of milk proteins, egg proteins, and lean animal proteins
will exhibit better health, and if an exercise component is
included, the conclusions in non-exercising individuals are
almost invalidated. Most of the research information promoted
specific to soy is publicized by organizations with a vested
interest in Soy Protein sales, such as The United Soybean
Board. I don’t mean to suggest that soy is not a good source
of protein, but rather that the health benefits, as is commonplace,
have been taken out of context and overblown to sell products.
From a metabolic benefit standpoint, it appears based on the
most recent and applicable studies, that you are best off
getting your supplemental protein from a mix of whey and casein
or egg. Watch as the newest protein supplements to hit the
market feature a whey & casein blend quoting research
that invalidates the research the same manufacturers used
to promote pure whey products only 12 months earlier.
With that said, (whew, that was exhausting), soy is a very
good and adequate protein source.
You Haven't Been There Yet:
on [ Fitness Superstore
] to get any of Phil's Proven products.
out about Phil's EAT Nutritional
additional info on TRANSFORM!
To Get Fit in 17 Days with The ANSWER!
on the [ MENU ] to explore other topics
and fitness truths.
Pages to Explore:
[ Feedback ]
designed and operated by
Phil Kaplan's Fitness Associates
1304 SW 160th Ave., #337
Fort Lauderdale, Florida 33326
(305) 824-5044 (954) 389-0280
Fax (954) 742-317