Molecule could prevent prediabetes

Levels of CoQ and the presence of insulin resistance were analysed in a range of experimental laboratory settings, mouse models and samples from humans, as part of an ambitious research collaboration conducted with the University of Sydney, Victor Chang Cardiac Research Institute, Duke University School of Medicine, Garvan Institute of Medical Research, Genentech Inc. and the University of New South Wales.

Concentrations of CoQ were found to be lower in insulin resistant body fat and muscle tissue. When the researchers replenished CoQ, insulin resistance or pre-diabetes was reversed. Co-author Dr Daniel Fazakerley from the University of Sydney's School of Life and Environmental Science and Charles Perkins Centre said CoQ provides a vital role in converting nutrients like fat and sugar into usable energy.

CoQ is found in mitochondria, the power plants in the cells of human body, where it is required for the flow of electricity to the cell's 'motor' which is responsible for energy production. Energy production can also generate reactive chemical species-often referred to as 'reactive oxygen species' or 'oxidants' as by-products, which can be damaging to cells. Previous studies have shown that these oxidants can cause insulin resistance. Our study has found that lower mitochondrial CoQ enhanced oxidant formation by mitochondria.

Replenishing CoQ in mitochondria, either in cells or in animals, we were able to restore 'normal' mitochondrial oxidants and reverse insulin resistance. Eating a high fat, high sugar diet has long been known to be a major risk factor for obesity and pre-diabetes. Replenishing CoQ could prove an invaluable preventive measure for insulin resistance- or pre-diabetes-linked diseases such as type 2 diabetes, cardiovascular disease, cancers and dementia.

However, oral CoQ supplements may not effectively restore mitochondrial CoQ due to its low absorption. The research has provided an impetus to find alternate means of increasing CoQ in mitochondria to treat insulin resistance and pre-diabetes. If not an external supplement, perhaps we can stimulate the body to form more of the coenzyme itself.
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Circadian timing of food and body mass index

Researchers examined the relationships between body fat, body mass index and the timing of food consumption, to time of day and to the body's circadian clock. They discovered that the timing of food intake relative to melatonin onset, a marker of a person's biological night, is associated with higher Body Mass Index BMI, and not associated with the time of day, amount or composition of food intake.

The time of calories consumption, relative to personal biological timing may be more important for health than the actual time of the day. Researchers analyzed data collected from different participants to monitor daily meal intake.

Investigation to assess the timing of their melatonin onset, marking onset of sleep, and their body composition.
Researchers found that individuals with high body fat percentages consumed most of their calories shortly before going to sleep when melatonin levels were high, compared to individuals with lower percentages of body fat.

Researchers found that they were unable to detect a relationship between the clock hour of food intake, caloric amount, meal composition, exercise level, or sleep duration, and either of these body composition measures.

Researchers concluded that these results provide evidence that the consumption of food during the circadian night, independent of more traditional risk factors such as amount or content of food intake and activity level, plays an important role in body composition.
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