Newsflash:
AHA revises statement
on soy protein
Benefits "minimal at best" Jan 20, 2006 Shelley
Wood
Dallas,
TX - Five years after it released a scientific advisory recommending
the inclusion of soy-protein foods in a diet low in saturated fat and
cholesterol, the American Heart Association has issued a revised statement,
going back on its earlier advice.
"The direct cardiovascular health benefit of soy protein or isoflavone
supplements is minimal at best," the new advisory states. "[U]se
of isoflavone supplements in food or pills is not recommended."
The new statement was published January 17, 2006 this week as a rapid
access paper in Circulation online [1].
For their analysis, the writing committee, led by Dr Frank M Sacks (Harvard
School of Public Health, Boston, MA), examined 22 randomized trials
comparing the effects of isolated soy protein with isoflavones with
milk or other proteins. They report that while soy products seemed to
reduce LDL cholesterol, the effect was trivial (around 3%) and only
in people who ate a lot of soy protein—roughly half their daily
protein intake. No effects of soy protein were seen
on HDL, triglycerides, lipoprotein
(a), or blood pressure. In 19 of 22 studies, the effect
on all lipid parameters was nil.
The
recommendation for physicians, Sacks told heartwire, is to tell their
patients "not to use isoflavone supplements,
since they are ineffective. Soy protein is not
much better than other proteins for cardiovascular health. A large amount
lowers LDL a little bit and does not affect the other CV lipids and
other risk factors."
Soy effects for other diseases: Mixed or nil
The statement authors also point out that studies examining soy's effects
on postmenopausal bone loss have been mixed and have failed
to show a clear benefit of soy for vasomotor symptoms of menopause
(hot flashes) or prevention of breast, endometrium, and prostate
cancer. People should look at the nutrient content of anything
they buy.
Of note, the statement distinguishes between isoflavone supplements
and soy-based foods, since foods that are high in soy may have some
cardiovascular benefits. Unlike animal-based proteins, soy-based foods
such as tofu, soy butter, soy nuts, and some soy burgers typically contain
polyunsaturated fats, fiber, vitamins, and minerals, but low amounts
of saturated fat, the authors note. In some settings, they say, replacing
proteins high in saturated fats with soy-based protein might translate
into cardiovascular benefits.
(Professor's Note: Saturated fat is NOT dangerous or
in any way unhealthy because there is no saturated fat in arterial clogs
and this was analyzed and published in Lancet back in 1994!
Read my landmark book The Hidden
Story of Cancer for the full story of LDL Cholesterol!
ALL Natural fats, whether they be cheese, cream, butter or the fat on
meat, are healthy and needed for good health. The dangerous fats are
transfats and artificial fats.)
But as with other fad foods of the past decade, it's important to read
the labels, Sacks points out. "People should look at the nutrient
content of anything they buy. Some of the soy products are quite good
but others may not be. . . . If the soy protein is in a product that
has low salt, no trans fat, and low saturated fat and has other healthy
ingredients like polyunsaturated fats and fiber that are in soybeans,
then the food would be good for CV health," he said.
(Professor's Note: My more than decade long studies in
health and science has shown, and proven that eating lots of vegetables
and fiber are NOT healthy and don't provide nutrition or any benefit
to protect you from disease. On the contrary, too much fiber can actually
lead to the development of colon cancer! Read my landmark book The
Hidden Story of Cancer for the full story!)
[emphases added]
Source: Sacks FM, Lichtenstein A, Van Horn L, et al. Soy protein,
isoflavones, and cardiovascular health. A statement for professionals
from the American Heart Association nutrition committee. Circulation
2006; DOI: 10.1161/. Available at: http://www.circulationaha.org.