If you watch the number of calories you're consuming, you probably think a quick workout is enough to offset the occasional fast food binge.

But that isn't necessarily the case, according to a chart from the UK's Royal Society for Public Health, which shows how long you need to exercise to burn off the calories you take in from popular junk foods.

For example, if you eat a quarter of a large pizza containing 449 calories, you would need to walk for 1 hour and 23 minutes or run for 43 minutes to burn it off. For a bar of milk chocolate with 229 calories, you would need to go on a 42-minute walk or a 22-minute run.

Here's the full chart:

calorie-graph.jpg
(Royal Society of Public Health)

You might think about doubling your workout time after reading this.

Read more:

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