Broccoli tegen astma en COPD*
Volgens een Amerikaanse studie beschermt broccoli niet alleen tegen kanker, maar ook tegen astma en andere luchtwegaandoeningen zoals hooikoorts en COPD. Broccoli
bevat de bioactieve stof sulforafaan , een chemische stof die de vorming van antioxidanten doet bevorderen. En wel die antioxidanten die de schadelijke stoffen, die we dagelijks inademen en ontstekingen van de luchtwegen kunnen veroorzaken neutraliseren.
In de studie kregen 65 vrijwilligers 3 dagen lang of bepaalde dosissen broccoli
of alfalfa. Alfalfa bevat geen sulforafaan en werd als placebo gebruikt. Bij het eten van 100 gram broccoli werden die antioxidanten al duidelijk verhoogd, bij 200 gram werden bepaalde
antioxidanten met meer dan 100% en 200% verhoogd in vergelijking tot het eten
van alfalfa.
Broccoli may help protect against respiratory conditions like asthma
Here's another reason to eat your broccoli: UCLA researchers report that a naturally occurring compound found in broccoli and other cruciferous vegetables may help protect against respiratory inflammation that causes conditions like asthma, allergic rhinitis and chronic obstructive pulmonary disease.
Published in the journal Clinical Immunology, the research shows that sulforaphane, a chemical in broccoli, triggers an increase of antioxidant enzymes in the human airway that offers protection against the onslaught of free radicals that we breathe in every day in polluted air, pollen, diesel exhaust and tobacco smoke. A supercharged form of oxygen, free radicals can cause oxidative tissue damage, which leads to inflammation and respiratory conditions like asthma.
"This is one of the first studies showing that broccoli sprouts — a readily available food source — offered potent biologic effects in stimulating an antioxidant response in humans," said Dr. Marc Riedl, the study's principal investigator and an assistant professor of clinical immunology and allergy at the David Geffen School of Medicine at
UCLA.
"We found a two- to three-fold increase in antioxidant enzymes in the nasal airway cells of study participants who had eaten a preparation of broccoli sprouts," Riedl said. "This strategy may offer protection against inflammatory processes and could lead to potential treatments for a variety of respiratory
conditions."
The UCLA team worked with 65 volunteers who were given varying oral doses of either broccoli or alfalfa sprout preparations for three days. Broccoli sprouts are the richest natural source of sulforaphane; the alfalfa sprouts, which do not contain the compound, served as a placebo.
Rinses of nasal passages were collected at the beginning and end of the study to assess the gene expression of antioxidant enzymes in cells of the upper airways. Researchers found significant increases of antioxidant enzymes at broccoli sprout doses of 100 grams and higher, compared with the placebo
group.
The maximum broccoli sprout dosage of 200 grams generated a 101-percent increase of an antioxidant enzyme called GSTP1 and a 199-percent increase of another key enzyme called NQO1.
"A major advantage of sulforaphane is that it appears to increase a broad array of antioxidant enzymes, which may help the compound's effectiveness in blocking the harmful effects of air pollution," Riedl said.
According to the authors, no serious side effects occurred in study participants receiving broccoli sprouts, demonstrating that this may be an effective, safe antioxidant strategy to help reduce the inflammatory impact of free radicals.
Riedl notes that more research needs to be done to examine the benefits of sulforaphane for specific respiratory conditions. It is too early to recommend a particular dosage.
Riedl recommends including broccoli and other cruciferous vegetables as part of a healthy
diet.
The study was supported by the National Institutes of Health, the National Institute of Environmental Health Sciences and the U.S. Environmental Protection Agency.
Other study authors include Dr. Andrew Saxon of the Hart and Louis Lyon Laboratory, division of clinical immunology and allergy in the department of medicine at the David Geffen School of Medicine at UCLA, and Dr. David Diaz-Sanchez of the human studies division of the U.S. Environmental Protection
Agency. (April
2009)
