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Article #259: The Joy of Soy: Health Benefits

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My husband has MS, and I have Diabetes. was to examine the effect of dietary soy
Researching health issues has become a with different isoflavone concentrations
"hobby" of mine. I am always interested on serum hormones in healthy young men.
in health issues. I am especially STUDY DESIGN. This study was conducted as
interested in soy because I am constantly a randomized, crossover trial with three
looking for protein to balance my groups. Young adult men 20 - 40 years of
diabetic meals. I am not a meat eater, age were randomly assigned to consume
although I am not a vegetarian either. I either (1) a milk protein isolate (MPI)
believe that knowledge is my best (0 mg isoflavones/day), (2) a
defense. low-isoflavone soy protein isolate (SPI)
Soy milk (also called soymilk, soya milk, (~2 mg isoflavones/day), or (3) a
soybean milk, soy bean milk, or soy high-isoflavone SPI (~62 mg isoflavones
drink) is a beverage produced from day) for 57 days. Blood samples were
soybeans. collected on days 1, 29, and 57 of the
Soy milk originated in East Asia, a study and serum reproductive hormones
region where soybean consumption in food were quantified.
and beverages is common. RESULTS. Both the low- and
Although its English name uses the word high-isoflavone soy groups had lower
"milk", due to its common use as a milk levels of dihydrotestosterone (DHT) and
substitute in Western societies, it is lower ratios of DHT/testosterone compared
actually a juice extracted from soybeans to the group receiving the milk protein
after soaking, grinding, cooking and isolate.
straining. It is generally opaque, white CONCLUSION. The results of this clinical
or off-white in color, and approximately trial indicate that soy with low or high
the same consistency as cow's milk. isoflavone content can lower serum
Soy Low in fat, rich in protein, soy has concentrations of DHT and reduce the DHT
become a staple in vegetarian diets. Soy testosterone ratio. The authors suggest
contains essential fatty acids, that these changes may have beneficial
phytoestrogens, vitamin E and natural effects on prostate health support, but
anti-inflammatory agents. that this requires further investigation.
Eating enough soy protein and soy MEDICAL REFERENCE: Dillingham BL, McVeigh
isoflavones is essential to obtain soy's BL, Lampe JW, Duncan AM. Soy protein
full benefits. An international panel of isolates of varying isoflavone content
leading soy researchers determined that exert minor effects on serum reproductive
100 to 160 milligrams of soy isoflavones hormones in healthy young men. Journal of
per day are likely needed to achieve all Nutrition 2005; 135:584-591.
of the potential benefits of soy Soy milk is found in many vegan and
isoflavones. The FDA states that 25 grams vegetarian food products and be used as a
of soy protein per day, with a diet low replacement for cow's milk in most
in saturated fat and cholesterol, may recipes. Such substitution has a low
reduce the risk of heart disease. impact on foods like pancakes, but there
Studies show soy isoflavones, the active is a noticeable difference when making
components of soybean, help increases foods such as macaroni and cheese or
bone density, thus maintain bone health. quiche.
Soy isoflavones act as mild estrogens "Sweet" and "salty" soy milk are both
that provide support through menopause. traditional Chinese breakfast foods,
In addition, soy isoflavones promote usually accompanied by breads like mantou
healthy cholesterol levels without (steamed rolls), youtiao (fried
lowering levels of beneficial HDL crullers), and shaobing (sesame
cholesterol. flatbread). The soy milk is typically
Another study shows that soy consumption sweetened by adding cane sugar or,
supports healthier metabolism of sometimes, simple syrup. Tofu is produced
dihydrotestosterone and testosterone in from soy milk by further steps of
younger men. This is critical for support curdling and then draining.
of healthier prostate tissues and Health benefits aside, I love Soy and
prostate function. I hope you have a good it's various products. Especially the
weekend. soy drinks. I find they work perfect
RESEARCH UPDATE: Soy Protein Exerts Minor into my personal diet. They're also low
Effects on Serum Reproductive Hormones in in calories and carbs. They have become
Healthy Young Men my personal favorite protein.
OBJECTIVE. The objective of this study






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