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Cutting back fat in your diet means you can lose weight and keep it off, even if you are not trying to slim down, according to research that will shape new global nutrition guidelines.
The international research, which included a Kiwi professor, was commissioned by the World Health Organisation.
Findings will be used to set recommendations on fat consumption. The ideal proportion of total fat in the human diet is currently unclear.
Calorie-dense diets are contributing to the growing obesity epidemic in western countries. People are not necessarily eating more, but they are eating foods that have higher calories.
Although "it may be difficult for populations to reduce total fat intake, attempts should be made to do so, to help control weight", researchers said.
New Zealand is the third fattest country in the OECD and two-thirds of the population are either overweight or obese.
These people are at a higher risk of many cancers, coronary heart disease, stroke and diabetes.
The research involved reviewing dozens of studies and trials, which compared people who ate low-fat diets and those who stuck to their normal eating regime.
People who ate less fat lost about 1.6 kilograms in six months.
They also saw their waistlines shrink, blood pressure drop and levels of bad cholesterol decrease.
Otago University human nutrition Professor Murray Skeaff co-authored the report, which was published in the British Medical Journal yesterday.