Lack of exercise, not dietary sugars, key to increased BMI in kids

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Washington, May 27 (ANI): Increased BMIs in children are most likely due to reduced energy expenditure, rather than dietary factors, reveals a new independent study of scientific research.

According to the research paper, 'Trends in energy and sugar intakes and body mass index between 1983 and 1997 among children in Great Britain', which was conducted by independent consultant nutritionist Sigrid Gibson MA MSc RPHNutr, contrary to the widely held hypothesis, dietary sugars are not the driving factor behind rising body mass index (BMI) levels in children in Great Britain.

The paper directly compared findings from two separate studies:

'The Diets of British Schoolchildren' conducted by the Department of health (DH) in 1983 (Department of Health 1989); and the National Diet and Nutrition Survey (NDNS) from 1997 (Gregory and Lowe, 2000).

Gibson's analysis found that total sugar intake averaged at 115g/day in 1983, compared with 113g/day in 1997. Allowing for exclusions of low and high energy reporters, intake levels were 122g/day (1983) and 127g/day (1997), showing a marginal and insignificant increase over the study period.

Contrastingly, mean body weight increased significantly during the period of the DH and NDNS surveys, showing a rise of 1.9kg for 10-11 year olds and 3.4kg among 14-15 year olds. BMI increased from 17.9 to 18.6 units in the younger group, and 20.2 to 21.3 units in the older group. According to these calculations, the prevalence of being overweight (plus obesity), as defined by the International Obesity Taskforce (IOTF) cut-offs (91st percentile) rose from 13 percent to 21-22 percent between surveys.

Gibson concluded that the slight increase in consumption of total sugars did not account for the significant increase in BMI, equivalent to 2-3 kg over the review period.

During the same period, Gibson found that mean energy intake (EI) was 3 percent lower in 1997 than in 1983, mainly as a result of lower fat intake. This change in overall energy consumption meant that sugars represented a higher proportion of daily energy intake in 1997 (23.6 percent versus 22.3 percent), despite total sugar consumption remaining relatively static in comparison. The review surmises that the most likely cause for the increased BMI is a decline in energy expenditure.

In addition, Gibson's paper found that basal metabolic rate (BMR) increased by approximately 3 percent between surveys as a result of higher body weights, and it is estimated that EI in relation to basal requirements was even lower at 6 percent. Gibson found that the paradox of rising BMI, despite a 2-3 percent rise in BMR and an EI that is static or falling, pointed to declining energy expenditure as an important factor in the change.

Gibson, the paper's author, said: "There are very few studies that have assessed trends in sugar intake over time and particularly over such an extended period. The findings of the reanalysis strongly contradict widespread assumptions that sugar levels in the diet are responsible for rising obesity levels.

With dietary sugar intakes relatively static, and overall energy consumption showing decline, increased BMI levels cannot be attributed to sugar consumption." (ANI)

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