The study is also interesting because it helps explain human studies showing that people who incorporate medium chain ‘fatty acids’, such as those found in coconut oil, into their diets can lose body fat.

Dr Nigel Turner and Associate Professor Jiming Ye, from Sydney’s Garvan Institute of Medical Research, compared fat metabolism and insulin resistance in mice fed coconut oil and lard based diets. Their findings are now published online in the international journal Diabetes.

“The medium chain fatty acids, like those found in coconut oil, are interesting to us because they behave very differently to the fats normally found in our diets,” said study leader Nigel Turner.

“Unlike the long chain fatty acids contained in animal fats, medium chain fatty acids are small enough to enter mitochondria – the cells’ energy burning powerhouses – directly, where they can then be converted to energy.”

“Unfortunately the downside to eating medium chain fatty acids is that they can lead to fat build up in the liver, an important fact to be taken into consideration by anyone considering using them as a weight loss therapy.”

Fat storage is determined by the balance between how much fat is taken in by cells and how much of this fat is burned for energy. When people eat a high fat diet, their bodies attempt to compensate by increasing their capacity to oxidise fat. The medium chain fatty acid (coconut oil) diet was more effective at increasing the oxidative capacity of muscle than the long chain fatty acid (lard) diet leading to less fat storage in muscle and better insulin action.

According to Turner, the lard-based diet used in this research is similar to the diet eaten by people in the Western world. “Its fatty acid composition is about 40% saturated fats, 40% monounsaturated fats and 20% polyunsaturated fats, of which the vast proportion is omega-6, rather than omega-3,” he said.

“Obese humans usually eat 40-50% of their calories as fat. Our mice were fed 45% of their calories as fat.”

“No high fat diet is good, and the normal dietary combination of long chain fats leads to an overload that our bodies can’t cope with. Therefore high consumption of common dietary fats is contributing directly towards the global escalation of obesity and Type 2 diabetes.”

“If someone is trying to prevent weight gain, we can see they may benefit from substituting oils containing medium chain fatty acids for other oils in their diet, as long as consideration is given to the potential problem of excess fat in the liver. Other natural dietary alternatives, such as fish oil, might be helpful because the fatty acids in fish oil are thought to exert a lot of their beneficial effects through improving fat oxidation in the liver.”

Source
Garvan Institute of Medical Research

Half of women fit into two other categories, the study says, and were found to be the least likely to be leaning toward fat. Both types of women in those groups are concerned about nutrition and like to eat healthy.

“The basic attitude that people have about food is related to the likelihood that they’re at risk for obesity and weight gain,” said researcher Dennis Degeneffe, a study co-author.

The study, which appears in the December issue of the journal Health Education & Behavior, placed 200 women into five groups based on their attitudes about food. The women had an average age of 46, were well-educated (two-thirds had a four-year degree or higher) and 86 percent were white.

The researchers then compared the groups of women by measurements such as percentage of body fat, waist size and body mass index (BMI).

Those deemed to be “concerned about nutrition” (determined to eat well) and “creative cooks” (focused on food for their families) scored the lowest in the weight categories. “Impulsive eaters” and “guilt-ridden dieters” scored the highest, with “busy cooking avoiders” in the middle.

“Women in the middle group tend to lead busy lifestyles and are often preoccupied with other activities and responsibilities, with eating generally taking a back seat,” said Degeneffe, a research fellow at the University of Minnesota’s Food Industry Center.

Cynthia Sass, a registered dietitian and author in New York City, said the categories defined in the study “truly parallel what I see with my clients and women I talk to regarding how food and nutrition fit into their lives.”

“I have found that women who have a big responsibility to take care of their families appear to do less well at taking care of themselves, food-wise,” she said. In some cases, she said, food helps them to feel rewarded and cope with their lives.

She urges them to focus on their own needs “because taking better care of themselves will help them have the physical and emotional wellness they need to continue taking care of their families.”

Treating these kinds of women can be tough, said Lona Sandon, an assistant professor at the University of Texas Southwestern and national spokesperson for the American Dietetic Association. “Health and nutrition may be important to them, but convenience often wins,” she said. “It is very challenging to come up with solutions to help these women lose weight if they are not willing or able to give up something else in their life.”

Health Education & Behavior, a peer-reviewed journal of the Society for Public Health Education (SOPHE), publishes research on critical health issues for professionals in the implementation and administration of public health information programs. For information, contact Laura Drouillard at (202) 408-9804.

Sudo, N, et al. Relationship between attitudes and indicators of obesity for midlife women. Health Education & Behavior 36(6), 2009.

Source: Health Behavior News Service