In Dublin, reports say changing the way food options and information is presented on food delivery apps and default smaller portions may encourage healthier selections.
These also include lowering the calorie intake by 4%-15% and showing three new randomized trials from the UK.
The prominent positioning of low-calorie menu items, and restaurants with low-calorie main meals, on a food app, emerged as the most promising approach to promote healthier eating.
This is followed by preselecting smaller portions by default, and finally, calorie labels.
The report was given by Anna Keleher, MPA, a behavioural scientist at Nesta, London UK.
It was at the European Congress on Obesity (ECO) meeting.