School kids are 50 per cent more likely to be overweight if they have attended nursery.
A study carried out by the University of Montreal and the CHU Sainte-Justine Hospital Research Centre discovered there is a link between childhood obesity and attendance at pre-school.
Dr Marie-Claude Geoffroy, who was the lead author on the investigation, found that known socio-economic factors, such as breastfeeding and the body mass index of the mother, could not explain the findings.
Some 1,649 parents with kids were followed for six years and interviewed about their care arrangements throughout this time, while the weight and height of their little ones was also measured.
Dr Sylvana Cote, co-director of the study, said that diet and a lack of physical activity could be the reason behind the prevalence for kids in daycare to put on weight.
"Parents don't have to worry; however, I suggest to parents they ensure their children eat well and get enough physical activity, whether at home or at daycare," she added.