Friday, August 3, 2012

Super Brain Foods

Superfoods for your Brain

Superfoods for your Brain
We’ve all had days when we didn’t feel like we were ‘on our game.’ And as we age, both our bodies and our brains grow old as well. By making smart food choices though, we can preserve our precious gray matter longer and improve brain function. Here are some brainy choices for keeping our noggins in tip-top shape.
Blueberries have been shown to shield the brain from stress, dementia, and Alzheimer’s disease. Research has also shown that diets rich in blueberries significantly improved both the learning capacity and motor skills.
Avocados, though considered a ‘fatty fruit,’ contribute to healthy blood flow and decreased blood pressure, lessening the chances of developing hypertension, which can lead to a stroke.
Deep-water fish, such as salmon is a wise, freshwater fish choice. It’s abundant in omega-3 essential fatty acids, which are essential for healthy brain function.
Nuts and seeds are good sources of vitamin E, an important vitamin needed by your brain to stave off declining cognitive functions. Cashews, peanuts, walnuts, sunflower and sesame seeds and almonds are all great choices.
Whole-grain breads, brown rice, and oatmeal also contribute to a healthy brain by reducing the risk for cardiac disease. By promoting a healthy heart and improved blood flow, the brain is sure to thrive via excellent oxygen and nutrient delivery through the bloodstream. Complex carbohydrates also supply the brain with a steady stream of glucose that enhances brain function. It's important to avoid simple carbohydrates often found in junk food because the glucose gives the brain a short-lived sugar high, often followed by a crash that makes you feel hungry and tired.
Freshly brewed tea also has potent antioxidants, especially the class known as catechines, which also promotes healthy blood flow. Since black teas do contain caffeine it’s important to use it sensibly.
Dark chocolate has powerful antioxidant properties, contains several natural stimulants, which enhance focus and concentration, and encourages the production of endorphins, which helps improve mood. Again, moderation is the key.

Thursday, July 19, 2012

Fast Food Addiction?

Fast Food

Hamburgers and French fries could be as addictive as heroin, scientists have claimed. Researchers in the United States have found evidence to suggest people can become overly dependent on the sugar and fat in fast food. The controversial findings add weight to claims that over-eating is simply down to a lack of self-control. It may also explain soaring rates of obesity in the western world.

Dr John Hoebel and colleagues at Princeton University in New Jersey based their theory on a study of rats.
'Cold turkey'

They found that rats fed a diet containing 25% sugar are thrown into a state of anxiety when the sugar is removed. Their symptoms included chattering teeth and the shakes - similar to those seen in people withdrawing from nicotine or morphine, according to researchers. Dr Hoebel said he believed high-fat foods stimulate opioids or 'pleasure chemicals' in the brain. "The implication is that some animals - and by extension some people - can become overly dependent on sweet food," he said.

Further studies published in New Scientist magazine back up this theory.

Ann Kelley, a neuroscientist at the University of Wisconsin Medical School, studied the behaviour of rats after the were given sweet, salty and fatty foods. She found a link between the brain's pleasure chemicals and a craving for this type of food. She stimulated the rats' brains with a synthetic version of the natural opioid enkephalin. This caused rats to eat up to six times their normal intake of fat. In addition, Dr Kelley identified long-lasting changes in rats' brain chemistry - similar to those caused by extended use of morphine or heroin. Dr Kelley said: "This says that mere exposure to pleasurable tasty foods is enough to change gene expression and that suggests that you could be addicted to food."

However, other experts expressed doubts over whether people can become addicted to food.

Michael Jacobson, executive director of the Center for Science in the Public Interest, a nutrition lobby group in Washington DC, said there was a lack of evidence. "I think the burden is on advocates of the addiction argument to provide evidence of addiction," he said.

Dr Jeane Randolph, from the University of Toronto, dismissed the theory. She said fast food causes blood sugar to peak and then plunge, creating a natural desire for another snack. "It's a set-up for a late-afternoon binge rather than addiction," she said.