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As more and more
Americans are turning to low-carbohydrate, high-protein diets
to lose weight quickly, some researchers are concerned that
these diets increase the risk of kidney stones and may increase
the risk of osteoporosis.
This small six-week study followed only ten healthy adults
who consumed their usual diet for two weeks, followed by the
low-carb, high-protein diet for two weeks, and then a diet
that only moderately restricted carbohydrates for four weeks.
It has been given an inordinate amount of press in an effort
to attack those following the Atkins program.
Volunteers lost nine pounds on average, but most developed
ketones, which raise the acid levels in the blood - some volunteers
acid levels rose by as much as 90%. Volunteers also showed
higher levels of calcium in their urine.
The researchers
were also concerned about the following with the fact that
high acid levels can weaken the kidneys and lead to kidney
stones. And animal protein, popular in LCHP diets, has been
shown to boost urinary excretion of oxalate, a compound that
combines with calcium and other compounds to form kidney stones.
What's more, the high levels of calcium in their urine suggest
a decreased absorption of the bone-building material -- and
an increased risk of osteoporosis.
American
Journal of Kidney Diseases 2002;40:265-274
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