Macadamianoten
goed voor hart en bloedvaten.*
Een handjevol macadamianoten per dag doen de bloedwaarden totaal cholesterol, het slechte cholesterol (LDL) en totaal triglyceriden duidelijk dalen blijkt uit een Amerikaanse studie. Daarmee doet de minder bekende macadamianoot niet onder voor de bekende noten zoals walnoten, hazelnoten en amandelen. Macadamianoten hebben 7% verzadigd, 18% enkelvoudig onverzadigd en 5% meervoudig onverzadigd vet.
Macadamia
Nuts Are Heart-Healthy
Incorporating
macadamia nuts into a heart healthy diet can reduce cardiovascular disease risks
according to Penn State researchers.
"We looked at macadamia nuts because they are not currently included in the
health claim for tree nuts, while other tree nuts are recommended as part of a
healthy diet," says Dr. Amy E. Griel, recent Ph.D. recipient in nutritional
sciences. "Macadamia nuts have higher levels of monounsaturated fats, like
those found in olive oil compared with other tree nuts."
The researchers used a controlled feeding study to compare a heart-healthy diet
with 1.5 ounces - a small handful - of macadamia nuts to a standard American
diet. The participants had slightly elevated cholesterol levels, normal blood
pressure and were not taking lipid lowering drugs. Researchers randomly assigned
participants to either the macadamia nut diet or the standard American diet and
provided all meals for the participants for five weeks. The participants then
switched diets and continued eating only food provided by the researchers for
another five weeks.
The Healthy Heart diet with macadamia nuts did reduce total cholesterol,
low-density lipoprotein cholesterol and triglyceride levels compared with the
standard American diet.
"We observed a reduction in LDL similar to that seen with other tree nuts
like walnuts and almonds," says Griel.
Individual calorie levels were used for each participant so that they did not
gain or lose weight during the study. Both diets were matched for total fat,
containing 33 percent calories from total fat. The Heart Healthy diet with
macadamia nuts had 7 percent saturated fat, 18 percent monounsaturated fat and 5
percent polyunsaturated fat. The standard American diet had 13 percent saturated
fat, 11 percent monounsaturated fat and 5 percent polyunsaturated fat.
The macadamia nut diet included macadamia nuts as a snack, mixed into meals, as
a salad topping and in cookies and muffins.
"The total fat was the same in both diets," says Griel. "We
substituted the macadamia nuts for other sources of fat and protein in the diet.
For example, we could switch skim milk for 2 percent milk and add some macadamia
nuts."
Macadamia nuts are native to Australia, but were imported to Hawaii and thrived.
The first commercials crop of Hawaiian macadamia nuts was harvested in 1956.
###
Researchers from the nutritional sciences department on this study included
Griel; Deborah M. Bagshaw, Clinical Coordinator Amy M. Cifelli, research
dietitian; Yumei Cao, graduate student and Penny M. Kris-Etherton, distinguished
professor.
(Juni 2007)