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Exercising on empty stomach may help burn more fat

Raghu Kshitiz

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KATHMANDU — Exercising on an empty stomach may help burn more fat and fuel favourable changes in your adipose tissue, which may be better for your health in the long term, a new study hasrevealed.

The study published in the American Journal of Physiology-Endocrinology and Metabolism analysed effects of eating versus fasting on gene expression in adipose (fat) tissue in response to exercise.

Researchers from University of Bath in the UK studied a group of overweight males, who were made to walk for 60 minutes at 60 per cent maximum oxygen consumption on an empty stomach and, on another occasion, two hours after consuming a high-calorie carbohydrate-rich breakfast.

After eating, adipose tissue “is busy responding to the meal and a bout of exercise at this time will not stimulate the same (beneficial) changes in adipose tissue”, explained corresponding author of the study Dylan Thompson from University of Bath in Britain.

“This means that exercise in a fasted state might provoke more favourable changes in adipose tissue, and this could be beneficial for health in the long term,” Thompson added.

“We propose that feeding is likely to blunt long-term adipose tissue adaptation to regular exercise,” the researchers noted in the study.

The research team took multiple blood samples after eating or fasting and after exercising and they also collected fat tissue samples immediately before and one hour after walking.

Gene expression in the adipose tissue differed significantly in the two trials.

The expression of two genes, PDK4 and HSL, increased when the men fasted and exercised and decreased when they ate before exercising.

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The rise in PDK4 likely indicates that stored fat was used to fuel metabolism during exercise instead of carbohydrates from the recent meal.

HSL typically increases when adipose tissue uses stored energy to support increased activity, such as during exercise, Thompson said.

These results reinforce the view that “adipose tissue often faces competing challenges,” Thompson wrote.

Their findings suggest that exercising on an empty stomach might provoke more favourable changes in adipose tissue, and this could be beneficial for health in the long term.

With IANS Inputs

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Life Style

Now, age 10-24 is the new adolescence period: Lancet study

IANS Indo Asian News Service

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Gradual changes in biological growth and social role transitions — coupled with delayed marriage and parenthood — have pushed back the period of adolescence between ages 10-24 rather than the previously known 10-19 years, according to a study,conducted by Lancet.

The study, published in the journal Lancet Child & Adolescent Health Friday, revealed that an early puberty has accelerated the onset of adolescence in nearly all populations, while understanding of continued growth has lifted its endpoint age well into the 20s.

The past century has seen drastic changes in the definition of adolescence, which encompasses elements of biological growth and major social role transitions.

“Rather than age 10-19 years, a definition of 10-24 years corresponds more closely to adolescent growth and popular understandings of this life phase and would facilitate extended investments across a broader range of settings,” said study lead author Susan M Sawyer from the Centre for Adolescent Health at the Royal Children’s Hospital in Melbourne.

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As a result of lifestyle changes, genetics and environmental factors, early puberty for girls at age 8-10 is the new ‘normal’.

While menstruation is a natural process, an early puberty results in various health issues, like depression and behavioural issues as well as the risk of cardiovascular disease and some cancers.

Similarly, young adults continuing their education for longer period, delayed marriage and parenthood, has pushed back popular perceptions of when adulthood begins.

“The transition period from childhood to adulthood now occupies a greater portion of the life course than ever before at a time when unprecedented social forces, including marketing and digital media, are affecting health and well-being across these years,” Sawyer noted.

An expanded and more inclusive definition of adolescence is essential for developmentally appropriate framing of laws, social policies and service systems, the researchers added.

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