Posts tagged chocolate
Articles and news from the latest research reports.
Key chocolate ingredients could help prevent obesity, diabetes
Improved thinking. Decreased appetite. Lowered blood pressure. The potential health benefits of dark chocolate keep piling up, and scientists are now homing in on what ingredients in chocolate might help prevent obesity, as well as type-2 diabetes. They found that one particular type of antioxidant in cocoa prevented laboratory mice from gaining excess weight and lowered their blood sugar levels. The report appears in ACS’ Journal of Agricultural & Food Chemistry.
Andrew P. Neilson and colleagues explain that cocoa, the basic ingredient of chocolate, is one of the most flavanol-rich foods around. That’s good for chocolate lovers because previous research has shown that flavanols in other foods such as grapes and tea can help fight weight gain and type-2 diabetes. But not all flavanols, which are a type of antioxidant, are created equal. Cocoa has several different kinds of these compounds, so Neilson’s team decided to tease them apart and test each individually for health benefits.
The scientists fed groups of mice different diets, including high-fat and low-fat diets, and high-fat diets supplemented with different kinds of flavanols. They found that adding one particular set of these compounds, known as oligomeric procyanidins (PCs), to the food made the biggest difference in keeping the mice’s weight down if they were on high-fat diets. They also improved glucose tolerance, which could potentially help prevent type-2 diabetes. “Oligomeric PCs appear to possess the greatest antiobesity and antidiabetic bioactivities of the flavanols in cocoa, particularly at the low doses employed for the present study,” the researchers state.
(Source: acs.org)
Pleasure Response from Chocolate: You Can See it in the Eyes
The brain’s pleasure response to tasting food can be measured through the eyes using a common, low-cost ophthalmological tool, according to a study just published in the journal Obesity. If validated, this method could be useful for research and clinical applications in food addiction and obesity prevention.
Dr. Jennifer Nasser, an associate professor in the department of Nutrition Sciences in Drexel University’s College of Nursing and Health Professions, led the study testing the use of electroretinography (ERG) to indicate increases in the neurotransmitter dopamine in the retina.
Dopamine is associated with a variety of pleasure-related effects in the brain, including the expectation of reward. In the eye’s retina, dopamine is released when the optical nerve activates in response to light exposure.
Nasser and her colleagues found that electrical signals in the retina spiked high in response to a flash of light when a food stimulus (a small piece of chocolate brownie) was placed in participants’ mouths. The increase was as great as that seen when participants had received the stimulant drug methylphenidate to induce a strong dopamine response. These responses in the presence of food and drug stimuli were each significantly greater than the response to light when participants ingested a control substance, water.
“What makes this so exciting is that the eye’s dopamine system was considered separate from the rest of the brain’s dopamine system,” Nasser said. “So most people– and indeed many retinography experts told me this– would say that tasting a food that stimulates the brain’s dopamine system wouldn’t have an effect on the eye’s dopamine system.”
This study was a small-scale demonstration of the concept, with only nine participants. Most participants were overweight but none had eating disorders. All fasted for four hours before testing with the food stimulus.
If this technique is validated through additional and larger studies, Nasser said she and other researchers can use ERG for studies of food addiction and food science.
“My research takes a pharmacology approach to the brain’s response to food,” Nasser said. “Food is both a nutrient delivery system and a pleasure delivery system, and a ‘side effect’ is excess calories. I want to maximize the pleasure and nutritional value of food but minimize the side effects. We need more user-friendly tools to do that.”
The low cost and ease of performing electroretinography make it an appealing method, according to Nasser. The Medicare reimbursement cost for clinical use of ERG is about $150 per session, and each session generates 200 scans in just two minutes. Procedures to measure dopamine responses directly from the brain are more expensive and invasive. For example, PET scanning costs about $2,000 per session and takes more than an hour to generate a scan.
(Image: Scott Thornburg)
Study links eating chocolate to winning Nobels
Take this with a grain of salt, or perhaps some almonds or hazelnuts: A study ties chocolate consumption to the number of Nobel Prize winners a country has and suggests it’s a sign that the sweet treat can boost brain power.
No, this does not appear in the satirical Onion newspaper. It’s in the prestigious New England Journal of Medicine, which published it online Wednesday as a “note” rather than a rigorous, peer-reviewed study.
The author — Dr. Franz Messerli, of St. Luke’s-Roosevelt Hospital and Columbia University in New York — writes that there is evidence that flavanols in green tea, red wine and chocolate can help “in slowing down or even reversing” age-related mental decline — a contention some medical experts may dispute.
Nevertheless, he examined whether a country’s per-capita chocolate consumption was related to the number of Nobels it had won — a possible sign of a nation’s “cognitive function.” Using data from some major chocolate producers on sales in 23 countries, he found “a surprisingly powerful correlation.”
Chocolate makes snails smarter
University of Calgary undergraduate Lee Fruson became curious about how dietary factors might affect memory, Ken Lukowiak was sceptical. ‘I didn’t think any of this stuff would work’, Lukowiak recalls. Despite his misgivings, Lukowiak and Fruson decided to concentrate on a group of compounds – the flavinoids – found in a wide range of ‘superfoods’ including chocolate and green tea, focusing on one particular flavonoid, (-)epicatechin (epi). However, figuring out how a single component of chocolate might improve human memory is almost impossible – too many external factors influence memory formation – so Lukowiak turned to his favourite animal, the pond snail Lymnaea stagnalis, to find out whether the dark chocolate flavonoid could improve their memories.
Adding to the mounting evidence that consuming moderate amounts of chocoloate may benefit the heart, comes that of a new study of Swedish men that suggests it may also lower the risk of stroke.