You'vebeen doing all you can, putting in the long hours and sweat at the gym in an effort to lose weight.
But it’s just not happening – instead, you’re actually gaining weight.
Take heart, new evidence shows that physical activity or exercise may not necessarily protect you from gaining weight.
The study, titled "Accelerometer-measured physical activity is not associated with two-year weight change in African-origin adults from five diverse populations", was conducted by the University of Loyola in Chicago.
The study, published in the journal PeerJ, included 2500 participants aged between 25 and 45, from South Africa, Ghana, the Seychelles, US and Jamaica and found that neither physical activity nor sedentary time were associated with weight gain.
Health experts have long advocated for an increase in levels of physical activity as a strategy to lower obesity levels.
The benefits of exercise in curbing non-communicable diseases and on mental health and mood are known. However, while physical activity burns calories, it also increases appetite – and people may compensate by eating more or by being less active for the rest of the day.
Participants wore tracking devices called accelerometers on their waists for a week. The devices measured the wearers' energy expenditure and step count. Researchers also measured participants’ weight, height and body fat. After an initial exam, participants were asked to return one year and two years later.
The study showed that physical activity was not associated with the future weight gain of the participants after a two-year follow-up with them.
At the initial measurements, the lowest weights captured were among men from Ghana and South Africa, at an average of 63 and 64kg respectively, and the highest among US men and women at an average of 93 and 91kg respectively.
The researchers categorised participants at each site by whether they met the US guidelines for physical activity (30 min/day) on most days of the week.
“Among the men, over 76% of Ghanaians (158) and South Africans (183) met the guidelines, compared to only 44% of US men (109). Far fewer women met this guideline, with only 44% of Ghanaian women (130), compared to about 20% of US women (50),” the study stated.
Surprisingly, researchers said, the total weight gain at every site was actually greater among participants who did meet the physical activity levels than those who didn’t.
Similarly, among the women, at each site, weight gain was less among the participants not meeting the physical activity guidelines.
“Importantly, this is not to say that physical activity per se is not important for overall achievement of health such as the prevention or delay of diabetes and cardiovascular disease, which is undisputed, but that its role in the prevention of population level weight gain may be overstated,” the study noted.
Researchers involved in the study said their data suggested that “other environmental factors that influence food consumption” may be a more fertile field for public research and health intervention.
Health and wellness expert Vanessa Ascencao said South Africans should educate themselves on a healthy lifestyle and practise a more mindful attitude to life.
She added that eating healthily should be seen as an investment rather than a burden.
“The vast benefits of living healthily include reducing the risk of depression, obesity, diabetes, diseases and improving overall quality of life,” she concluded.