How do citrus
fruits help in weight loss?
According to researchers, Vitamin C
& naringenin, found abundantly in all citrus fruits, have a fat burning
quality.
Vitamin CVitamin C reduces the effectiveness of fat. It reduces its content and can liquefy or dilute fat. By diluting the fat, it makes it less effective, and easier to flush out of your system. Vitamin C also works on cholesterol deposits. Vitamin C can help burn out the cholesterol, hence, making it difficult for cholesterol deposits to form in blood vessels.
Naringenin – A phytonutrients present in citrus fruits
Citrus fruits mainly consist of
various water-soluble plant pigments collectively called as flavonoids. Of all
the flavonoids, the most abundant one is naringenin, a naturally occurring
alkaline compound in all citrus fruit, but most significantly in grapefruit,
orange and tomato.
Naringenin has a significantly
positive bioactive effect on human health as a fat blaster (weight loss agent),
antioxidant, anti-inflammatory agent, carbohydrate metabolism promoter and
immunity system modulato
.
US study – Naringenin, a key to fighting obesity
US study – Naringenin, a key to fighting obesity
In 2006, a scientific study was
performed by the Florida Department of Citrus at the California Scripp's
Clinic. It was found that by adding 4 ounces of grapefruit juice or half a
grapefruit to meals, participants had an average weight loss of 3 1/2
pounds a week without altering their diet in any other way.
Researchers believed a compound, naringenin, in the grapefruit helped the
liver lower cholesterol and also helped regulate insulin levels. Both of these
factors had a significant impact on overall weight reduction of the subjects.
It should be noted that obesity
constitutes the main part of the “metabolic syndrome” that is also
characterized by hypertension, elevated blood cholesterol and disturbed glucose
and insulin metabolism.
Canadian
study – Naringenin, as an effective weight reducer and maintainer
In another study performed at the
Roberts Research Institute at the University of Western Ontario, the study mice
were divided into four groups. They fed one group a normal, healthy diet. The
second group received a high-fat, high-calorie diet. The third and fourth
groups received a high-fat, high-calorie diet along with a naringenin
supplement.
After just four weeks, the mice on the
high-fat, high-calorie diet became obese. In addition, they became insulin and
glucose intolerant. On the other hand, the two groups who received the naringenin
supplement fared much better. Despite the same high-fat, high-calorie diet,
these mice did not gain weight like their counterparts. In addition, the
naringenin mice did not develop key health factors linked to Metabolic
Syndrome. In fact, they lowered their triglyceride and cholesterol levels. They
also continued to metabolize glucose normally and they never developed a
resistance to insulin. At the end of the study, it was found that naringenin
had marked lipid- and lipoprotein-lowering potential, without affecting caloric
intake or fat absorption.
It was also found that naringenin, in
concentrations far above levels found naturally, makes the liver burn fat
instead of storing it. These effects were independent of caloric intake as the
mice ate exactly the same amount of food and the same amount of fat. There was
no suppression of appetite or decreased food intake, which are often the basis
of strategies to reduce weight gain and its metabolic consequences.
As a conclusion, it was suggested that
naringenin metabolizes hepatic VLDL (very low density lipoprotein) production,
improves glucose tolerance and insulin sensitivity and prevents obesity
associated with high-fat diet.
(Mulvihill et
al., Diabetes journal, July 10, 2009)
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