Newsgroup: it.salute.alimentazione
Titolo: l'importanza del latte per chi è a dieta

A higher-protein diet that emphasizes lean meats and low-fat dairy foods as 
sources of protein and calcium can mean weight loss without bone loss--and the 
evidence is in bone scans taken throughout a new University of Illinois study.
The research, which compared the results of a high-protein, dairy-intensive 
diet with a conventional weight-loss diet based on the food-guide pyramid, was 
published in this month's Journal of Nutrition.
"This is an important finding because many people, especially women in 
mid-life, are concerned with both obesity and osteoporosis," said Ellen Evans, 
a U of I associate professor of kinesiology and community health and member of 
the U of I Division of Nutritional Sciences.
"Furthermore, treating obesity often increases risk for osteoporosis. Many 
people lose bone mass when they lose weight," she said.
Study co-author Donald Layman, a U of I professor of nutrition, has previously 
reported that protein-rich weight-loss diets preserve muscle mass, help lower 
blood sugar and lipids, and improve body composition by targeting weight 
carried in the abdomen.
In the recent study, Layman's diet prescribed approximately 30 percent of all 
calories from protein, with an emphasis on lean meats and low-fat dairy products.
The scientists recruited and randomized 130 middle-aged, overweight persons at 
two sites--the U of I and Pennsylvania State University. Participants then 
followed either the higher-protein weight-loss diet or a conventional 
higher-carbohydrate weight-loss diet based on the food-guide pyramid for four 
months of active weight loss followed by eight months of weight maintenance.
"Essentially we substituted lean meats and low-fat milk, cheese, yogurt, etc., 
for some of the high-carbohydrate foods in the food-pyramid diet. Participants 
also ate five servings of vegetables and two to three servings of fruit each 
day," Evans said.
Bone mineral content and density were measured with DXA scans of the whole 
body, lumbar spine, and hip at the beginning of the study, at four months, at 
eight months, and at the end of the 12-month period.
"In the higher-protein group, bone density remained fairly stable, but bone 
health declined over time in the group that followed the conventional 
higher-carbohydrate diet. A statistically significant treatment effect favored 
the higher-protein diet group," said Matthew Thorpe, a medical scholars 
(MD/PhD) student who works in Evans's lab and was the primary author of the study.
"The combination and/or interaction of dietary protein, calcium from dairy, 
and the additional vitamin D that fortifies dairy products appears to protect 
bone health during weight loss," he added.
Because higher-protein diets have been associated with elevated urinary 
calcium levels, some scientists have feared that these diets cause bone 
demineralization.
The U of I team measured these levels at the beginning and eight months into 
the study. Although the researchers did note increased amounts of urinary 
calcium in the higher-protein group, they attributed the source of the 
increased calcium to improved intestinal absorption of calcium rather than 
bone loss.
"Other recent studies using radiolabeled calcium have shown that the higher 
urinary calcium levels associated with higher-protein diets are not coming 
from bone as some researchers had believed," Thorpe said.
The U of I scientists will soon begin a similar study contrasting 
higher-protein, dairy-rich diets with conventional weight-loss diets in older, 
mildly frail women.
"We'll measure bone and muscle outcomes in the two groups after six months of 
weight loss. Ultimately we want to know if a higher-protein weight-loss diet 
that emphasizes lean meats, whey protein, and low-fat dairy consumption can 
reduce the risk for osteoporosis and muscle loss.
"We also want to learn how these changes in body composition will affect 
balance, gait, and other measures of physical function in this population 
known to be at high risk for osteoporosis and physical disability," she said.
Other co-authors of the study are Edward H. Jacobson and Xuming He of the 
University of Illinois and Penny M. Kris-Etherton of Pennsylvania State 
University. The research was funded by the Illinois Council on Food and 
Agricultural Research (C-FAR), the National Cattlemen's Beef Association, The 
Beef Board, Kraft Foods, and the U.S. Department of Agriculture, which 
supplied the funds for Thorpe's fellowship.
University of Illinois at Urbana-Champaign (2008, June 6). How To Lose Weight 
Without Losing Bone.
http://www.sciencedaily.com
­/releases/2008/06/080605113006.htm
-- 
bye
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 Agriculture, which supplied the funds for Thorpe's fellowship.
IMHO occorre cautela supplementare quando le conclusioni di una
ricerca convergono vistosamente con le aspettative di chi l'ha
finanziata. ;)

 finanziata. ;)
se fosse come tu sostieni la ricerca avrebbe mostrato solo l'importanza della 
carne visto che tra i finanziatori "sospetti" ci sono solo associazioni di 
produttori di carne, non di produttori di latte
questo tuo messaggio conferma la mia impressione che lo scopo principale di 
chi interviene in questo newsgroup sia solo di prodursi in una puerile gara a 
chi ce lo ha metaforicamente più lungo, usando per di più argomenti del tutto
pretestuosi e infondati... siete proprio noiosi


 infondati... siete proprio noiosi
Digerito male? 
Scherzi a parte, i gruppi di discussione servono per discutere, non
per affermare verità senza contraddittorio. Questo lo dico a te ma
anche ad altri che sembrano avere lo stesso atteggiamento di fronte a
un'osservazione dialettica. 
Non so da quanto tempo segui il NG, ma ti assicuro che le mie
osservazioni sono come petali di margherita, a confronto di alcuni
scontri spinosi e rocciosi visti in passato.
Dovresti anzi ringraziarmi per aver posto delle domande che, dal tuo
punto di vista, ti hanno permesso di chiarire e ribadire la bontà
dello studio, no?
Personalmente, aggiungo a scanso di equivoci, non faccio il tifo a
priori né contro né a favore del latte o dello yogurt, che mi
piacciono e bevo moderatamente.., ma mi pare quasi
doveroso porre dubbi e domande rispetto a una nuova ricerca, anche al
limite facendo l'avvocato del diavolo. 

il latte della parmalat addizionato di calcio contiene anche tanta vit
D. non sono collegate per un buon assorbimento?