New Zealanders are not getting slimmer, with 63 per cent now overweight or obese.

The recently released Roy Morgan State of the Nation Report 3 found that in September, only 35 per cent of New Zealanders had a Body Mass Index indicating an acceptable weight, 3 per cent down from 2009.

The figures show 28 per cent of the population is obese, up 3 per cent from December 2001.

When looking at New Zealanders attitudes towards weight-loss over the last 10 years, similar shifts are reflected with 60 per cent of the population reporting that they would like to be able to lose weight, and 38 per cent saying that they are constantly watching their weight.

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Despite this, those who considered a low fat diet a way of life fell 3 per cent to 30 per cent in the same period.