On current trends, some 89% of Irish men will be overweight by 2030, and nearly half obese, said a World Health Organization study to be presented at a European Congress on Obesity in Prague.
This was up from 74% overweight, and 26% obese in 2010 in one of Europe's fattest nations.
The growing numbers of overweight and obese people are a growing cause of disease and disability around the world.
"Even in countries with a traditionally lower prevalence of obesity such as Sweden, obesity rates are predicted to rise sharply," the congress report said.
Over a quarter of Swedish men will be obese by 2030, and 22% of women.
People with a BMI (body weight index, a ratio of weight to height) of 25 and higher are classified overweight, and 30 and over obese.
In the UK, "one third (33%) of women are forecast to be obese in 2030, compared with over one quarter (26%) in 2010," the congress press statement said.
Sixty-four percent of UK women and 74% of men will be overweight in 2030.
"Overall, the data show no evidence of a plateau in adult obesity in most countries," said the statement.
Other countries with projected steep rises in obesity over this period include Greece, Spain, Austria and the Czech Republic, according to the study of 53 countries.
An estimated 77% of Greek men are predicted to be overweight by 2030 and 67% of women, and the proportion of obese men and women will more than double from 20% to about 40%.
For Spain, obesity in women is set to rise from 16% in 2010 to 21% in 2030, and in men from 19% to 36%, said the statement issued by congress organisers.
About 37% of women in the Czech Republic, hosting the gathering, will be obese by 2030 and 36% of men.
The Dutch are the thinnest of the lot, according to the study.
About 49% of men will be overweight and 8% obese by 2030, compared to 54% and 10% in 2010. For women, overweight rates will remain stable at around 43/44%, while obesity is likely to drop from 13% to 9%.
A study last November by the McKinsey Global Institute said more than 2.1 billion people globally -- nearly 30% of the world population -- are now overweight or obese.
Obesity was causing about 5% of all deaths worldwide, it said, and costing the global economy $2 trillion (1.8 trillion euros) in healthcare and lost productivity -- or 2.8% of global GDP.
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