Eating tree nuts tied to lowered obesity risk
BY ANDREW M. SEAMAN
NEW YORK Thu Jan 9, 2014 5:38pm EST
(Reuters Health) - A new U.S. study adds to growing evidence that nuts - once considered too fattening to be healthy - may in fact help keep weight down, in addition to offering other health benefits.
Researchers found that study participants who ate the most tree nuts - such as almonds, Brazil nuts, pistachios and walnuts - were between 37 and 46 percent less likely to be obese than those who ate the fewest tree nuts.
People who ate the most nuts were also less likely to have a suite of risk factors known as metabolic syndrome, which is tied to increased risk of heart disease and diabetes.
"This is another study that shows there is an association between eating nuts and not being obese and having less tendency to have metabolic syndrome," Dr. Joan Sabate told Reuters Health.
Sabate is the study's senior author from Loma Linda University in California.
The study, which was published online in PLOS ONE, was partially funded through a grant from the International Tree Nut Council Nutrition Research and Education Foundation (INC NREF).
In another recent study, also funded by INC NREF, researchers found that people who reported eating the most nuts were less likely to die over a 24-year period than those who ate the fewest nuts (see Reuters Health story of November 20, 2013 here: reut.rs/1fgGUQE>.
While such evidence can't show that nuts cause the differences seen between people who love them and those who pass them by, there are reasons to believe nuts provide a direct benefit, Sabate said.
For example, nuts are high in unsaturated fat, which is known as a "good" fat compared to the saturated fat found in animal products. The high protein content of nuts may also lead people to feel fuller and eat less unhealthy foods. They also contain of host of other nutrients and plant chemicals that are beneficial to health, Sabate said.
For the new study, the researchers used data on the diets of 803 Seventh-day Adventist men and women in the U.S. who were already enrolled in another study.
Overall, those who ate a lot of tree nuts - about 16 grams (half an ounce) per day - were just a little over normal weight, on average, compared to those who ate few or no nuts and were seriously overweight or obese.
A normal body mass index (BMI) - a measure of weight in relation to height - for an adult falls between 18.5 and 24.9, according to the U.S. Centers for Disease Control and Prevention. Overweight people have BMIs between 25 and 29.9 and a BMI of 30 or more is considered obese.
People in the study who ate the most nuts averaged BMIs of about 27 while those who ate the least - less than 5 grams of tree nuts per day - averaged BMIs of 29 to 30.
The researchers also found that one third of the participants in the study had metabolic syndrome, which is defined as having three or more conditions associated with heart disease and diabetes risk. (Those include being obese, having high blood pressure and high cholesterol, and having a large waistline).
For every one-ounce serving of tree nuts consumed per week, however, a person's risk of having metabolic syndrome dropped by 7 percent.
Jeffrey Blumberg, a professor of nutrition at Tufts University in Boston who was not involved in the new research, said it is consistent with a number of previous studies showing that including nuts in one's diet is beneficial.
"It really is at a point now where I think there is a large body of evidence and is - I would even say - a consensus of nuts being a healthful food choice if consumed in reasonable amounts," Blumberg said.
SOURE: PLOS ONE, online January 8, 2014.
Tree Nuts Are Inversely Associated with Metabolic Syndrome and Obesity: The Adventist Health Study-2
Karen Jaceldo-Siegl , Ella Haddad, Keiji Oda, Gary E. Fraser, Joan Sabate
Published: January 08, 2014DOI: 10.1371/journal.pone.0085133
To examine the relationships of nut consumption, metabolic syndrome (MetS), and obesity in the Adventist Health Study-2, a relatively healthy population with a wide range of nut intake.
Research Design and Methods
Cross-sectional analysis was conducted on clinical, dietary, anthropometric, and demographic data of 803 adults. MetS was defined according to the American Heart Association and the National Heart, Lung, and Blood Institute diagnostic criteria. We assessed intake of total nuts, tree nuts and peanuts, and also classified subjects into low tree nut/low peanut (LT/LP), low tree/high peanut (LT/HP), high tree nut/high peanut (HT/HP), and high tree/low peanut (HT/LP) consumers. Odds ratios were estimated using multivariable logistic regression.
32% of subjects had MetS. Compared to LT/LP consumers, obesity was lower in LT/HP (OR = 0.89; 95% CI = 0.53, 1.48), HT/HP (OR = 0.63; 95% CI = 0.40, 0.99) and HT/LP (OR = 0.54; 95% CI = 0.34, 0.88) consumers, p for trend = 0.006. For MetS, odds ratios (95% CI) were 0.77 (0.47, 1.28), 0.65 (0.42, 1.00) and 0.68 (0.43, 1.07), respectively (p for trend = 0.056). Frequency of nut intake (once/week) had significant inverse associations with MetS (3% less for tree nuts and 2% less for total nuts) and obesity (7% less for tree nuts and 3% less for total nuts).
Tree nuts appear to have strong inverse association with obesity, and favorable though weaker association with MetS independent of demographic, lifestyle and dietary factors.
|<< 前記事(2014/01/09)||ブログのトップへ||後記事(2014/01/18) >>|
|<< 前記事(2014/01/09)||ブログのトップへ||後記事(2014/01/18) >>|