(BBC) A stroll after Christmas dinner is part of many families' festive timetable - but heart experts say a pre-dinner walk is a good idea.
Glasgow University research for the British Heart Foundation found it could help reduce the damage done by too much Christmas pudding.
It says a 90-minute walk lowers fat levels in the blood and improves blood vessel function.
The study is published in the Journal of the American College of Cardiology.
They said the health benefits of a long stroll remained even after the walker had eaten a high-fat, high-carbohydrate meal.
The researchers studied 10 lean and 10 obese middle-aged men.
Each was tested twice for his response to a fatty meal, with the tests performed a week or two apart.
On the afternoon before one of the tests, each man walked on a treadmill for 90 minutes. In the second test, no exercise was done.