They recommend that people watching their weight need to cut out fizzy, sugar-sweetened drinks, potatoes and refined grain foods like white rice and low-fibre breakfast cereals.
And they should eat a lot more `natural` foods, like fruit and vegetables, whole grains, nuts and yoghurt, while avoiding anything processed.
`Small dietary and other lifestyle changes can together make a big difference - for bad or good. This makes it easy to gain weight unintentionally, but also demonstrates the tremendous opportunity for prevention,` the report quoted Dariush Mozaffaria, study co-author as saying.
Nutritionist Angela Dowden said: `This research singles out once again the benefits of minimally processed foods like fruits, vegetables, whole grains, nuts and yoghurt.